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Climate change : How do we know ?

› en español Earth's climate has changed throughout history. Just in the last 650,000 years there have been seven cycles of glacial advance and retreat, with the abrupt end of the last ice age about 11,700 years ago marking the beginning of the modern climate era — and of human civilization. Most of these climate changes are attributed to very small variations in Earth’s orbit that change the amount of solar energy our planet receives. Scientific evidence for warming of the climate system is unequivocal. The current warming trend is of particular significance because most of it is extremely likely (greater than 95% probability) to be the result of human activity since the mid-20th century and proceeding at a rate that is unprecedented over decades to millennia.1 Earth-orbiting satellites and other technological advances have enabled scientists to see the big picture, collecting many different types of information about our planet and its climate on a global scale. Global Temperature Rise

https://climate.nasa.gov/evidence/

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Short Answers to Hard Questions About Climate Change 3. Is there anything I can do about climate change? Fly less, drive less, waste less. Climate change: Oceans 'soaking up more heat than estimated' Image copyright Getty Images The world has seriously underestimated the amount of heat soaked up by our oceans over the past 25 years, researchers say. Their study suggests that the seas have absorbed 60% more than previously thought. They say it means the Earth is more sensitive to fossil fuel emissions than estimated. This could make it much more difficult to keep global warming within safe levels this century.

Causes of climate change Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down rainforests and farming livestock. This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming. Greenhouse gases

Protesting Climate Change, Young People Take to Streets in a Global Strike The day began in the Asia-Pacific region. More than 100,000 protested in Melbourne, in what organizers said was the largest climate action in Australia’s history. The rally shut down key public transport corridors for hours. In Sydney, thousands gathered in the Domain, a public park east of the Central Business District — grandparents escorting their children holding homemade signs, groups of teenagers in school uniforms, parents handing out boxed raisins to their young children. Global warming and climate change effects: information and facts The signs of global warming are everywhere, and are more complex than just climbing temperatures. Video Player is loading. Current Time 0:00 Duration 2:49

Climate change: Arctic reindeer numbers crash by half Image copyright KAJ R. SVENSSON/SCIENCE PHOTO LIBRARY The population of wild reindeer, or caribou, in the Arctic has crashed by more than half in the last two decades. A new report on the impact of climate change in the Arctic revealed that numbers fell from almost 5 million to around 2.1 million animals. The report was released at the American Geophysical Research Union meeting. Global climate strike: how you can get involved The global climate strike kicks off on Friday and will ripple across the world in more than 4,000 locations, the start of a weeklong movement to train international attention on the climate emergency. It’s the latest of a succession of strikes on Fridays led by schoolchildren – but this time adults are invited to join in. What will happen?

Climate Change Climate Change is the defining issue of our time and we are at a defining moment. From shifting weather patterns that threaten food production, to rising sea levels that increase the risk of catastrophic flooding, the impacts of climate change are global in scope and unprecedented in scale. Without drastic action today, adapting to these impacts in the future will be more difficult and costly. The Human Fingerprint on Greenhouse Gases Greenhouse gases occur naturally and are essential to the survival of humans and millions of other living things, by keeping some of the sun’s warmth from reflecting back into space and making Earth livable.

East Antarctica's glaciers are stirring Image copyright Michael Studinger/Nasa/Icebridge Nasa says it has detected the first signs of significant melting in a swathe of glaciers in East Antarctica. The region has long been considered stable and unaffected by some of the more dramatic changes occurring elsewhere on the continent. But satellites have now shown that ice streams running into the ocean along one-eighth of the eastern coastline have thinned and sped up. If this trend continues, it has consequences for future sea levels.

Evaluation publication: peer reviewed, most reliable status of author: recognized expert by many, most reliable supporting data: two or more high quality studies with matching results, most reliable scientific explanations: it is explained that humans are responsible. it shows examples and explanations on how the earth is warming up by greenhouse gases and that it is increasing by human activity. most reliable by mbrothers Dec 14

more explanation, causes, and effects on the website. by mbrothers Dec 14

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