Starting in 1979, satellites started measuring the temperature of the Earth.
Before 1850, there were not enough temperature measurements for us to know how warm or cold it was.
Many people have tried to get countries to emit less greenhouse gases. It was meant to reduce the amount of greenhouse gases in the atmosphere to below their levels in 1990.
However, carbon dioxide levels have continued to rise.
Consequently, many part of the world have a major increase in temperature.
Among the Greenhouse gases, the concentration and increase of carbon dioxide in the atmosphere appears to be the main cause of global warming, as predicted by Svante Arrhenius a hundred years ago, confirming the work of Joseph Fourier more than 200 years ago.The gas produced by cows digestion also causes global warming, because it contains a greenhouse gas called methane.Climate change has happened many times over the history of the Earth, including the coming and going of ice ages. Since the 1800s, people have recorded the daily temperature.Sea level is rising steadily as a result from continental ice melting into the sea.As a prediction, many cities are soon to be partially submerged in the ocean.Many scientists say that in the next 100–200 years, temperatures might be up to 6 °C (11 °F) higher than they were before the effects of global warming were discovered.Most noticeable changes by this increase in temperature is the melting of ice caps all around the world.Climatologists use proxy measurements to try to figure out past temperatures before there were thermometers.This means measuring things that change when it gets colder or warmer.Coal-burning power plants, car exhausts, factory smokestacks, and other man-made waste gas vents give off about 23 billion tons of carbon dioxide and other greenhouse gases into the Earth's atmosphere each year.The amount of CO The sun gets a little bit hotter and colder every 11 years. The change is so small that scientists can barely measure how it affects the temperature of the Earth.