[David Attenborough]: We are a flexible and innovative species

and we have the capacity to adapt and modify our behavior

Now, we most certainly have to do so if we're to deal with climate change.

It's the biggest challenge we have yet faced.

[Bill Nye]: The same thing that keeps the Earth warm

CO2!

May make the Earth too warm

It holds in heat

Methane, Chloroflourocarbons, water vapor and

Carbon dioxide - they all trap heat

Methane, Chloroflourocarbons, water vapor and

Carbon dioxide - they all trap heat

[Isaac Asimov]: It is important that the world get together

To face the problems which attack us as a unit

[Richard Alley]: The evidence is clear

[Nye]: The globe is getting too warm

[Alley]: We can avoid climate catastrophies

We can do this

[Nye]: We can change the world

[Alley]: Science offers us answers

To these huge challenges

[Nye]: It's one global ecosystem

[Alley]: We can do this

[Nye]: We can change the world

Every single thing every one of us does

Affects everybody all over the world

It's one global ecosystem

Warm, wet, cold or dry

Climates all start in the sky

Warm, wet, cold or dry

Climates all start in the sky

When the C02 is high, the temperature is high

Moving together in lock step

When the C02 is low, the temperature is low

Moving together

[Isaac Asimov]: It is important that the world get together

To face the problems which attack us as a unit

[Richard Alley]: The evidence is clear

[Nye]: The globe is getting too warm

[Alley]: We can avoid climate catastrophies

We can do this

[Nye]: We can change the world

[Alley]: Science offers us answers

To these huge challenges

[Nye]: It's one global ecosystem

[Alley]: We can do this

[Nye]: We can change the world

[Richard Alley]: Our use of fossil fuels for energy is pushing us towards a climate

unlike any seen in the history of civilization

Adding carbon dioxide to the atmosphere

Warms things up

The rise in C02

Comes from burning fossil fuels

When you burn them, add oxygen

That makes C02 that goes in the air

We're reversing the process by which they formed

[Asimov]: We're talking about something

That affects the entire Earth

Problems that transcend nations.

It is important that the world get together

To face the problems which attack us as a unit

[Richard Alley]: The evidence is clear

[Nye]: The globe is getting too warm

[Alley]: We can avoid climate catastrophies

We can do this

[Nye]: We can change the world

[Alley]: Science offers us answers

To these huge challenges

[Nye]: It's one global ecosystem

[Alley]: We can do this

[Nye]: We can change the world