What We Know About Climate Change | MIT Climate Portal. New to Climate Change? Visit the MIT Climate Primer. What We Know About Climate Change. The Earth's climate is changing faster today than ever before in the history of our species - and human actions are the main reason why. The Science. Climate change is a long-term change in the average weather patterns that have come to define Earth's local, regional and global climates. These changes have a broad range of observed effects that are synonymous with the term. Causes and Effects of Climate Change. Fossil fuels - coal, oil and gas - are by far the largest contributor to global climate change, accounting for over 75 per cent of global greenhouse Climate change (or global warming), is the process of our planet heating up. Scientists estimate that since the Industrial Revolution, human activity has caused the Earth to warm by approximately 1°C. While that might not sound like much, it means big things for people and wildlife around the globe. Climate change is the long-term shift in the Earth's average temperatures and weather conditions. The world is now about 1.1C warmer than in the late 19th Century. Are Tjuprfd.

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