How do we know climate change is real?

While Earth’s climate has changed throughout its history, warming is now happening at a rate not seen in the past 10,000 years. Scientific information taken from natural sources (such as ice cores, rocks, and tree rings) and from modern equipment (like satellites and instruments) all show the signs of a changing climate. Source: NASA

The UN Intergovernmental Panel on Climate Change (IPCC) is the United Nations body for assessing the science related to climate change. The governments of all of 193 UN member countries accept its findings. The IPCC states: ‘Since systematic scientific assessments began in the 1970s, the influence of human activity on the warming of the climate system has evolved from theory to established fact’.