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

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and we have the capacity to adapt and modify our behavior

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

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It's the biggest challenge we have yet faced.

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

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CO2!

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May make the Earth too warm

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It holds in heat

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Methane, Chloroflourocarbons, water vapor and

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Carbon dioxide - they all trap heat

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Methane, Chloroflourocarbons, water vapor and

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Carbon dioxide - they all trap heat

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

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To face the problems which attack us as a unit

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[Richard Alley]: The evidence is clear

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[Nye]: The globe is getting too warm

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[Alley]: We can avoid climate catastrophies

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We can do this

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[Nye]: We can change the world

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[Alley]: Science offers us answers

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To these huge challenges

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[Nye]: It's one global ecosystem

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[Alley]: We can do this

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[Nye]: We can change the world

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Every single thing every one of us does

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Affects everybody all over the world

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It's one global ecosystem

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Warm, wet, cold or dry

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Climates all start in the sky

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Warm, wet, cold or dry

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Climates all start in the sky

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When the C02 is high, the temperature is high

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Moving together in lock step

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When the C02 is low, the temperature is low

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Moving together

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

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To face the problems which attack us as a unit

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[Richard Alley]: The evidence is clear

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[Nye]: The globe is getting too warm

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[Alley]: We can avoid climate catastrophies

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We can do this

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[Nye]: We can change the world

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[Alley]: Science offers us answers

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To these huge challenges

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[Nye]: It's one global ecosystem

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[Alley]: We can do this

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[Nye]: We can change the world

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

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unlike any seen in the history of civilization

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Adding carbon dioxide to the atmosphere

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Warms things up

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The rise in C02

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Comes from burning fossil fuels

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When you burn them, add oxygen

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That makes C02 that goes in the air

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We're reversing the process by which they formed

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[Asimov]: We're talking about something

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That affects the entire Earth

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Problems that transcend nations.

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It is important that the world get together

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To face the problems which attack us as a unit

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[Richard Alley]: The evidence is clear

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[Nye]: The globe is getting too warm

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[Alley]: We can avoid climate catastrophies

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We can do this

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[Nye]: We can change the world

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[Alley]: Science offers us answers

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To these huge challenges

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[Nye]: It's one global ecosystem

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[Alley]: We can do this

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[Nye]: We can change the world