Can We Cool the Planet?

As global temperatures rise, scientists are exploring solutions from planting trees to sucking carbon out of the air to geoengineering. But would they work? And what are the risks of engineering Earth's climate?

Season 47 Episode 16 Length 53:31 Premiere: 10/28/20

Recent Episodes

Zero to Infinity

S49 E19 Length 53:32 Premiere Date 11/16/22

Crypto Decoded

S49 E18 Length 53:22 Premiere Date 11/09/22

Nazca Desert Mystery

S49 E17 Length 53:31 Premiere Date 11/02/22

Ocean Invaders

S49 E16 Length 53:32 Premiere Date 10/26/22

Can Psychedelics Cure?

S49 E15 Length 53:47 Premiere Date 10/19/22

Computers v. Crime

S49 E14 Length 53:30 Premiere Date 10/12/22

Clips & Previews

Can We Cool the Planet? Promo

Preview Length 00:28 Premiere Date 10/28/20

How Much Coal Do People Burn Each Year?

Clip Length 02:13 Premiere Date 10/28/20

How Much Coal do People Burn Each Year?

Clip Length 02:13 Premiere Date 10/28/20

What is Solar Geoengineering and Why is it Controversial?

Clip Length 04:16 Premiere Date 10/28/20

What is Solar Geoengineering and Why is it Controversial?

Clip Length 04:16 Premiere Date 10/28/20

Meet the NASA Scientist Who Uses Lasers to Study Forests

Clip Length 04:05 Premiere Date 10/28/20

Antarctica: Journey to the Bottom of the Earth

Clip Length 14:11 Premiere Date 01/29/20

How Antarctica’s Cutest Baby Seals Grow Up

Clip Length 10:50 Premiere Date 02/05/20

Why is this Antarctic Glacier “Bleeding?”

Clip Length 10:00 Premiere Date 02/11/20

What is it Like to Live in Antarctica?

Clip Length 09:41 Premiere Date 02/26/20

Three Solutions That Can Slow or Stop Climate Change

Clip Length 04:21 Premiere Date 06/04/20

Cutting our Greenhouse Gas Emissions to Zero

Clip Length 04:52 Premiere Date 06/19/20

Can Geoengineering “Undo” Climate Change?

Clip Length 04:41 Premiere Date 06/24/20

Specials

Picture a Scientist (with Audio Description)

Length 1:52:37 Premiere Date 04/14/21

Looking for Life on Mars (with Audio Description)

Length 53:46 Premiere Date 02/24/21

Beyond the Elements: Life (with Audio Description)

Length 53:17 Premiere Date 02/17/21

Beyond the Elements: Indestructible (with Audio Description)

Length 53:17 Premiere Date 02/10/21

Beyond the Elements: Reactions (with Audio Description)

Length 53:17 Premiere Date 02/03/21

Secrets in our DNA (with Audio Description)

Length 53:26 Premiere Date 01/13/21

Treasures Metals Eiffel Tower

Length 02:09 Premiere Date 12/09/16

A Labyrinth of Lava

Length 01:13 Premiere Date 11/02/15

Driving Dinosaur Diversity

Length 01:47 Premiere Date 10/22/15

Pangea

Length 00:56 Premiere Date 10/22/15

Making Granite From Volcanic Rock

Length 02:16 Premiere Date 10/22/15

A Massive Volcanic Eruption

Length 01:14 Premiere Date 10/22/15

From Mud to Rock

Length 01:36 Premiere Date 10/22/15

Finding Stromatolites

Length 01:23 Premiere Date 10/22/15

Stromatolites Were Kings

Length 01:05 Premiere Date 10/22/15

Ancient Life

Length 00:28 Premiere Date 10/22/15

Millions of Years Captured in Chalk

Length 01:17 Premiere Date 10/22/15

A Fourteen-Foot Fish From Kansas

Length 01:38 Premiere Date 10/22/15

Hell Creek Formation

Length 01:10 Premiere Date 10/22/15

No Dinosaurs Above the Line

Length 02:00 Premiere Date 10/22/15

Mammal Survivors

Length 01:40 Premiere Date 10/22/15

Dinosaur Fossils

Length 01:53 Premiere Date 10/22/15

King of Gore

Length 02:00 Premiere Date 10/22/15

Manhattan Skyline

Length 00:52 Premiere Date 10/21/15

New York's Mountains

Length 01:13 Premiere Date 10/21/15

Rock Time Capsules

Length 01:18 Premiere Date 10/21/15

The Sandstone Top of the Canyon

Length 01:15 Premiere Date 10/21/15

Fossil-Filled Limestone

Length 00:54 Premiere Date 10/21/15

The Grand Canyon's Oldest Rocks

Length 00:19 Premiere Date 10/21/15

From Lava to Land

Length 02:14 Premiere Date 10/21/15

Semi-Precious Pebbles

Length 00:57 Premiere Date 10/21/15

Five Steps of Volcanic Rock

Length 00:26 Premiere Date 10/21/15

Tearing North America Apart

Length 01:01 Premiere Date 10/21/15

Fossilized Sand Dunes

Length 01:15 Premiere Date 10/21/15

Volcanoes of Sand

Length 01:33 Premiere Date 10/21/15

Rockies 2.0

Length 02:00 Premiere Date 10/21/15

Manhattan Schist

Length 01:13 Premiere Date 10/21/15

Grand Canyon 4

Length 00:19 Premiere Date 08/02/15

Mendenhall Glacier

Length 02:51 Premiere Date 08/02/15

Monument Rocks 1

Length 01:18 Premiere Date 08/02/15

Monument Rocks 2

Length 01:48 Premiere Date 08/02/15

Exuma Cays 1

Length 01:26 Premiere Date 08/02/15

Exuma Cays 3

Length 00:28 Premiere Date 08/02/15

Exuma Cays 4

Length 03:22 Premiere Date 08/02/15

Gooseberry Falls 1

Length 00:57 Premiere Date 08/02/15

Gooseberry Falls 2

Length 00:24 Premiere Date 08/02/15

Gooseberry Falls 3

Length 01:06 Premiere Date 08/02/15

Gooseberry Falls 4

Length 01:01 Premiere Date 08/02/15

Mount Kilauea

Length 01:30 Premiere Date 08/02/15

Grand Canyon 1

Length 01:19 Premiere Date 08/02/15

Grand Canyon 2

Length 01:05 Premiere Date 08/02/15

Grand Canyon 3

Length 00:58 Premiere Date 08/02/15

Lethal Seas Excerpt 1

Length 04:11 Premiere Date 05/12/15

Lethal Seas Excerpt 2

Length 01:00 Premiere Date 05/12/15

Lethal Seas Excerpt 3

Length 00:35 Premiere Date 05/12/15

Lethal Seas Excerpt 4

Length 00:51 Premiere Date 05/12/15

The Mother of Hubble

Length 02:28 Premiere Date 04/14/15

Formation of a Typhoon

Length 01:34 Premiere Date 06/25/14

Flatfish Larvae

Length 00:51 Premiere Date 05/06/14

RNAi Explained

Length 01:47 Premiere Date 04/22/14

Dolphin Mirror

Length 03:18 Premiere Date 04/22/14

Dogs' Sense of Time

Length 01:28 Premiere Date 04/13/14

Cockatoo Excerpt

Length 01:30 Premiere Date 04/08/14

How Solar Cells Work

Length 00:33 Premiere Date 02/26/14

Solar Power's Promise

Length 00:51 Premiere Date 02/26/14

Microneedle

Length 01:41 Premiere Date 12/30/13

Non-Newtonian Gel

Length 01:00 Premiere Date 11/15/13

GM Plants

Length 01:27 Premiere Date 11/15/13

Soft-Story Buildings

Length 07:36 Premiere Date 11/13/13

Levitation

Length 00:50 Premiere Date 10/24/13

Superconductor

Length 01:47 Premiere Date 10/24/13

Animal Robot 1

Length 02:35 Premiere Date 10/24/13

Animal Robot 2

Length 02:02 Premiere Date 10/24/13

Therapeutic Hypothermia

Length 01:11 Premiere Date 10/24/13

Therapeutic Hypothermia 2

Length 01:07 Premiere Date 10/24/13

Therapeutic Hypothermia 3

Length 01:43 Premiere Date 10/24/13

Therapeutic Hypothermia 4

Length 02:01 Premiere Date 10/24/13

Swarming Robots

Length 01:31 Premiere Date 10/21/13

Sneak Peek: Making Stuff Wilder

Length 06:14 Premiere Date 10/21/13

Sail Wing

Length 01:02 Premiere Date 10/19/13

Hydrofoil

Length 01:01 Premiere Date 10/19/13

Chicken Feathers

Length 01:56 Premiere Date 10/19/13

KillaCycle

Length 00:48 Premiere Date 10/19/13

How Batteries Work

Length 00:49 Premiere Date 10/19/13

Muon Detection

Length 01:52 Premiere Date 10/19/13

Muons

Length 01:25 Premiere Date 10/19/13

Plants White

Length 02:11 Premiere Date 10/19/13

DNA Patch

Length 01:19 Premiere Date 10/19/13

DNA Vaccine

Length 00:38 Premiere Date 10/19/13

Earthquake Test

Length 02:03 Premiere Date 10/19/13

David Drives

Length 01:27 Premiere Date 10/19/13

Virus Battery

Length 02:21 Premiere Date 10/19/13

Shelley

Length 02:07 Premiere Date 10/19/13

Robot Arm

Length 00:56 Premiere Date 10/19/13

Elephant Arm

Length 01:22 Premiere Date 10/19/13

FinGripper

Length 00:55 Premiere Date 10/19/13

Hagfish Defense

Length 01:36 Premiere Date 10/17/13

Slime Clothes

Length 01:00 Premiere Date 10/17/13

Pitcher Plant

Length 01:48 Premiere Date 10/17/13

SLIPS

Length 01:01 Premiere Date 10/17/13

Hagfish

Length 00:51 Premiere Date 10/17/13

New York City One Year Later: Telecommunications

Length 03:14 Premiere Date 10/16/13

Sneak Peek: Making Stuff Faster

Length 05:06 Premiere Date 10/15/13

David's Race

Length 01:28 Premiere Date 10/15/13

Steffen's Plan

Length 01:59 Premiere Date 10/15/13

Traveling Salesman

Length 01:21 Premiere Date 10/15/13

Eye Robot

Length 01:51 Premiere Date 10/10/13

Corkscrew Robot

Length 00:32 Premiere Date 10/10/13

Slow Goldfish

Length 01:39 Premiere Date 10/10/13

Bee Toxin

Length 01:31 Premiere Date 10/10/13

Mild Traumatic Brain Injury

Length 03:36 Premiere Date 10/07/13

Invisibility Cloak

Length 01:22 Premiere Date 09/24/13

Shape Memory Alloys

Length 00:32 Premiere Date 09/08/13

Jellyfish

Length 00:38 Premiere Date 09/08/13

Bird Wings

Length 01:56 Premiere Date 09/08/13

Shrinking Chips

Length 01:06 Premiere Date 09/05/13

Pizza Transistor

Length 01:34 Premiere Date 09/05/13

Graphene

Length 01:11 Premiere Date 09/05/13

Wheat Straw Plastic

Length 01:04 Premiere Date 08/29/13

Solar Leaves

Length 00:53 Premiere Date 08/29/13

Battle Jacket

Length 01:49 Premiere Date 08/29/13

Oobleck

Length 00:40 Premiere Date 08/29/13

Magnetic Oobleck

Length 00:54 Premiere Date 08/29/13

Life-Saving Non-Newtonian Fluids

Length 01:43 Premiere Date 08/29/13

Silicon Transistors

Length 00:50 Premiere Date 08/29/13

Starling 8

Length 00:44 Premiere Date 07/15/13

sandy-raw-1-2

Length 00:04 Premiere Date 07/08/13

sandy-raw-5-1

Length 01:02 Premiere Date 07/08/13

Chemotherapy Goes Small

Length 01:17 Premiere Date 07/01/13

The Making of a Cloud Old

Length 03:10 Premiere Date 06/30/13

Why So Many Cloud Types?

Length 03:35 Premiere Date 06/30/13

Clouds and Weather

Length 03:21 Premiere Date 06/30/13

Severe Storms

Length 03:37 Premiere Date 06/30/13

The Climate Wild Card

Length 03:02 Premiere Date 06/30/13

Life on Europa?

Length 02:25 Premiere Date 06/09/13

CloudLab_Megastorm_03

Length 01:41 Premiere Date 05/29/13

CloudLab_Megastorm_04

Length 01:43 Premiere Date 05/29/13

CloudLab_Megastorm_05

Length 01:04 Premiere Date 05/29/13

CloudLab_Megastorm_06

Length 00:40 Premiere Date 05/29/13

CloudLab_Megastorm_07

Length 03:07 Premiere Date 05/29/13

CloudLab_Megastorm_01

Length 00:35 Premiere Date 05/28/13

CloudLab_Megastorm_02

Length 00:31 Premiere Date 05/28/13

What Made the 1918 Flu So Deadly?

Length 01:28 Premiere Date 05/13/13

How the 1918 Flu Infected People

Length 00:25 Premiere Date 05/13/13

Fertilizing the Amazon

Length 03:27 Premiere Date 04/21/13

Flu Probabilities

Length 01:53 Premiere Date 04/16/13

Rare Earth Elements

Length 04:17 Premiere Date 04/01/13

CHNOPS: Ingredients for Life

Length 02:36 Premiere Date 03/12/13

Electromagnetic Spectrum

Length 00:44 Premiere Date 02/28/13

MODIS Sensor

Length 00:26 Premiere Date 02/28/13

Solving the Storage Problem

Length 02:26 Premiere Date 10/25/12

Putting Energy to Use Old

Length 02:14 Premiere Date 10/08/12

The Fabric of the Cosmos: What Is Space?

Length 53:02 Premiere Date 11/01/11

Season 47 Episodes

Show Episodes

Show Clips & Previews

Beyond the Elements: Life

S47 E19 Length 53:17 Premiere Date 02/17/21

Beyond the Elements: Indestructible

S47 E18 Length 53:17 Premiere Date 02/10/21

Beyond the Elements: Reactions

S47 E17 Length 53:17 Premiere Date 02/03/21

Can We Cool the Planet?

S47 E16 Length 53:31 Premiere Date 10/28/20

Touching the Asteroid

S47 E15 Length 53:32 Premiere Date 10/21/20

A to Z: How Writing Changed the World

S47 E14 Length 53:32 Premiere Date 09/30/20

A to Z: The First Alphabet

S47 E13 Length 54:02 Premiere Date 09/23/20

Secret Mind of Slime

S47 E12 Length 53:17 Premiere Date 09/16/20

Human Nature

S47 E11 Length 1:33:41 Premiere Date 09/09/20

Decoding COVID-19

S47 E10 Length 53:38 Premiere Date 05/13/20

Nature's Fear Factor

S47 E9 Length 53:21 Premiere Date 10/14/20

Saving Notre Dame

S47 E8 Length 53:52 Premiere Date 11/25/20

Eagle Power

S47 E7 Length 53:22 Premiere Date 05/20/20

The Truth About Fat

S47 E6 Length 53:33 Premiere Date 04/08/20

Cuba's Cancer Hope

S47 E5 Length 53:09 Premiere Date 04/01/20

Mysteries of Sleep

S47 E4 Length 53:26 Premiere Date 02/26/20

Cat Tales

S47 E3 Length 53:40 Premiere Date 02/19/20

Dog Tales

S47 E2 Length 54:11 Premiere Date 02/12/20

Polar Extremes

S47 E1 Length 1:52:42 Premiere Date 02/05/20

Can We Cool the Planet? Promo

Preview Length 00:28 Premiere Date 10/28/20

How Much Coal Do People Burn Each Year?

Clip Length 02:13 Premiere Date 10/28/20

How Much Coal do People Burn Each Year?

Clip Length 02:13 Premiere Date 10/28/20

What is Solar Geoengineering and Why is it Controversial?

Clip Length 04:16 Premiere Date 10/28/20

What is Solar Geoengineering and Why is it Controversial?

Clip Length 04:16 Premiere Date 10/28/20

Meet the NASA Scientist Who Uses Lasers to Study Forests

Clip Length 04:05 Premiere Date 10/28/20

Antarctica: Journey to the Bottom of the Earth

Clip Length 14:11 Premiere Date 01/29/20

How Antarctica’s Cutest Baby Seals Grow Up

Clip Length 10:50 Premiere Date 02/05/20

Why is this Antarctic Glacier “Bleeding?”

Clip Length 10:00 Premiere Date 02/11/20

What is it Like to Live in Antarctica?

Clip Length 09:41 Premiere Date 02/26/20

Three Solutions That Can Slow or Stop Climate Change

Clip Length 04:21 Premiere Date 06/04/20

Cutting our Greenhouse Gas Emissions to Zero

Clip Length 04:52 Premiere Date 06/19/20

Can Geoengineering “Undo” Climate Change?

Clip Length 04:41 Premiere Date 06/24/20

See All Episodes

TV Schedules

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Emperor's Ghost Army

Premiered On: 11/12/2014

The program reveals the secrets of China's Terracotta Army, built to serve its first emperor, Qin Shi Huang Di in the afterlife, and brings to life the startlingly sophisticated world of Qin's legendary empire.

Wednesday December 7, 2022 12:00 am ET on KETWORLD
Tuesday December 6, 2022 11:00 pm CT on KETWORLD
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Ghosts of Stonehenge

Premiered On: 10/11/2017

Who built Stonehenge, and why? Groundbreaking archaeological digs have revealed major new clues about Britain's enigmatic 5,000-year-old site and the people who constructed it.

Wednesday December 7, 2022 9:00 pm ET on KET
Wednesday December 7, 2022 8:00 pm CT on KET
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Rebuilding Notre Dame

Engineers, masons and timber workers work to restore Paris's iconic Notre Dame Cathedral.

Wednesday December 14, 2022 9:00 pm ET on KET
Wednesday December 14, 2022 8:00 pm CT on KET
Thursday December 15, 2022 1:00 pm ET on KET
Thursday December 15, 2022 12:00 pm CT on KET
Friday December 16, 2022 2:00 am ET on KET
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Colosseum - Roman Death Trap

Premiered On: 02/11/2015

Archaeologists and engineers are teaming up to recreate a 25-foot lifting machine and trap door system capable of releasing a wolf into the Colosseum's arena for the first time in 1,500 years.

Sunday December 18, 2022 7:00 pm ET on KET2
Sunday December 18, 2022 6:00 pm CT on KET2
Tuesday December 20, 2022 12:00 am ET on KET2
Monday December 19, 2022 11:00 pm CT on KET2
Tuesday December 20, 2022 5:00 am ET on KET2
Tuesday December 20, 2022 4:00 am CT on KET2

Fighting for Fertility

Premiered On: 05/12/2021

What causes infertility, and how can assisted reproductive technologies help? Follow the journeys of people navigating fertility challenges from structural inequalities and racism to falling sperm counts, egg freezing and IVF.

Sunday December 25, 2022 7:00 pm ET on KET2
Sunday December 25, 2022 6:00 pm CT on KET2
Tuesday December 27, 2022 12:00 am ET on KET2
Monday December 26, 2022 11:00 pm CT on KET2
Tuesday December 27, 2022 5:00 am ET on KET2
Tuesday December 27, 2022 4:00 am CT on KET2

The Truth About Fat

Premiered On: 04/08/2020

Scientists are coming to understand fat as a system akin to an organ. Explore the mysteries of fat and its role in hormone production, hunger, and even pregnancy.

Wednesday December 28, 2022 9:00 pm ET on KET
Wednesday December 28, 2022 8:00 pm CT on KET
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Sunday January 1, 2023 7:00 pm ET on KET2
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Tuesday January 3, 2023 12:00 am ET on KET2
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Jump to Upcoming Airdates

Recent

Emperor's Ghost Army - S41 E20

Tuesday December 6, 2022 7:00 pm ET on KETWORLD
Tuesday December 6, 2022 6:00 pm CT on KETWORLD

Deadliest Tornadoes - S39 E10

Tuesday December 6, 2022 12:00 am ET on KET2
Monday December 5, 2022 11:00 pm CT on KET2
Monday December 5, 2022 3:00 am ET on KET2
Monday December 5, 2022 2:00 am CT on KET2

Chinese Chariot Revealed - S44 E9

Thursday December 1, 2022 1:00 pm ET on KET
Thursday December 1, 2022 12:00 pm CT on KET

Ancient Maya Metropolis - S48 E22

Thursday November 24, 2022 1:00 pm ET on KET
Thursday November 24, 2022 12:00 pm CT on KET

Zero to Infinity - S49 E19

Wednesday November 23, 2022 8:00 am ET on KETWORLD
Wednesday November 23, 2022 7:00 am CT on KETWORLD
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Crypto Decoded - S49 E18

Wednesday November 16, 2022 8:00 am ET on KETWORLD
Wednesday November 16, 2022 7:00 am CT on KETWORLD
Wednesday November 16, 2022 12:00 am ET on KETWORLD
Tuesday November 15, 2022 11:00 pm CT on KETWORLD
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Thursday November 10, 2022 1:00 pm ET on KET
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Nazca Desert Mystery - S49 E17

Wednesday November 9, 2022 8:00 am ET on KETWORLD
Wednesday November 9, 2022 7:00 am CT on KETWORLD
Wednesday November 9, 2022 12:00 am ET on KETWORLD
Tuesday November 8, 2022 11:00 pm CT on KETWORLD
Tuesday November 8, 2022 7:00 pm ET on KETWORLD
Tuesday November 8, 2022 6:00 pm CT on KETWORLD
Tuesday November 8, 2022 12:00 am ET on KET2
Monday November 7, 2022 11:00 pm CT on KET2
Sunday November 6, 2022 7:00 pm ET on KET2
Sunday November 6, 2022 6:00 pm CT on KET2

Top

Can We Cool the Planet?

Recent Episodes

Zero to Infinity

Crypto Decoded

Nazca Desert Mystery

Ocean Invaders

Can Psychedelics Cure?

Computers v. Crime

Sponsored by:

Clips & Previews

Can We Cool the Planet? Promo

How Much Coal Do People Burn Each Year?

How Much Coal do People Burn Each Year?

What is Solar Geoengineering and Why is it Controversial?

What is Solar Geoengineering and Why is it Controversial?

Meet the NASA Scientist Who Uses Lasers to Study Forests

Antarctica: Journey to the Bottom of the Earth

How Antarctica’s Cutest Baby Seals Grow Up

Why is this Antarctic Glacier “Bleeding?”

What is it Like to Live in Antarctica?

Three Solutions That Can Slow or Stop Climate Change

Cutting our Greenhouse Gas Emissions to Zero

Can Geoengineering “Undo” Climate Change?

Specials

Picture a Scientist (with Audio Description)

Looking for Life on Mars (with Audio Description)

Beyond the Elements: Life (with Audio Description)

Beyond the Elements: Indestructible (with Audio Description)

Beyond the Elements: Reactions (with Audio Description)

Secrets in our DNA (with Audio Description)

Treasures Metals Eiffel Tower

A Labyrinth of Lava

Driving Dinosaur Diversity

Pangea

Making Granite From Volcanic Rock

A Massive Volcanic Eruption

From Mud to Rock

Finding Stromatolites

Stromatolites Were Kings

Ancient Life

Millions of Years Captured in Chalk

A Fourteen-Foot Fish From Kansas

Hell Creek Formation

No Dinosaurs Above the Line

Mammal Survivors

Dinosaur Fossils

King of Gore

Manhattan Skyline

New York's Mountains

Rock Time Capsules

The Sandstone Top of the Canyon

Fossil-Filled Limestone

The Grand Canyon's Oldest Rocks

From Lava to Land

Semi-Precious Pebbles

Five Steps of Volcanic Rock

Tearing North America Apart

Fossilized Sand Dunes

Volcanoes of Sand

Rockies 2.0

Manhattan Schist

Grand Canyon 4

Mendenhall Glacier

Monument Rocks 1

Monument Rocks 2

Exuma Cays 1

Exuma Cays 3

Exuma Cays 4

Gooseberry Falls 1

Gooseberry Falls 2

Gooseberry Falls 3

Gooseberry Falls 4

Mount Kilauea

Grand Canyon 1

Grand Canyon 2

Grand Canyon 3

Lethal Seas Excerpt 1

Lethal Seas Excerpt 2

Lethal Seas Excerpt 3

Lethal Seas Excerpt 4