The Intergovernmental Panel on Climate Change (a.k.a. the IPCC) stated in its most recent report (AR4, 2007) that, “it is extremely unlikely that global climate change of the past 50 years can be explained without external forcing, and very likely that it is not due to known natural causes alone.”

What this means is that scientists are now very confident in stating that observed climate change has been caused by humans and in particular, their release of greenhouse gases, namely carbon dioxide.

The consensus in the scientific community is that climate change is real, and occurring now. The evidence is overwhelming that humans are having a negative impact on the Earth’s climate, and something needs to be done. Now.

Rapid warming in the Arctic is melting sea ice, putting the survival of animals, including polar bears in jeopardy.

 Understanding Climate Change

What is climate change?

How much carbon dioxide have we emitted?

Who is the IPCC?

Weather or Climate?

El Nino and La Nina

Studying the polar ice caps with satellites

Links

Skeptical science – a website that answers every objection you have heard to the science of climate change

CO2 now – provides up-to-date information on the current concentration of CO2

IPCC fourth assessment report – the leading global synthesis on the present state of knowledge on climate change (not sure where to start? Try the summary for policymakers)