Global warming is the rise in the average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation. Warming of the climate system is unequivocal, and scientists are more than 95% certain that it is primarily caused by increasing concentrations of greenhouse gases produced by human activities. These findings are recognized by the national science academies of all major industrialized nations. 

Global warming that is evident in a stream of temperature records and natural anomalies all over the planet is consistent with a wide range of observations, as documented by many independent scientific groups. Examples include sea level rise (water expands as it warms), widespread melting of snow and ice, increased heat content of the oceans, increased humidity, and the earlier timing of spring events, e.g., the early flowering of plants. Human activity since the Industrial Revolution has increased the concentrations of CO2 and methane by 36% and 148% respectively since 1750.


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These levels are much higher than at any time during the last about 20 million years. Fossil fuel burning has produced about three-quarters of the increase in CO2 from human activity over the past 20 years. For example, global CO2 emissions in 2011 from fossil fuel combustion, including cement production and gas flaring, was 34.8 billion tones (9.5 ± 0.5 PgC), an increase of 54% above emissions in 1990! Record drought along with series of floods in USA, record heat in Europe, rising sea levels, enormously powerful tornadoes and hurricanes all over the world – those are direct effects of global warming. Climate change already resulted in the extinction of many species and reduced diversity of ecosystems.

Another grave danger of global warming is dramatic increase in ocean acidity cause by dissolved CO2. This process is known as ocean acidification and has been called the "equally evil twin" of global climate change. The current rate of ocean acidification is many times faster than at least the past 300 million years, which included four mass extinctions, which killed 95% of marine species. By the end of the century, acidity changes since the industrial revolution would be so high so we might lose up to 50% of marine flora and fauna.
Global warming has no national borders. Thus, by 2100, while population of Earth is expected to double, rice and maize yields - main food products in Third World countries - expected to decrease by up to 40%, which in its turn may ignite a chain of major social and human catastrophic events.
Slowly, but surely, human kind kills its own habitat.

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