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Global warming and climate change are terms for the observed century-scale rise in the average temperature of the Earth's climate systems and its related effects.Multiple lines of scientific evidence show that the climate system is warming. Although the increase of near-surface atmospheric temperature is the measure of global warming often reported in the popular press, most of the additional energy stored in the climate system since 1970 has gone into ocean warming. The remainder has melted ice, and warmed the continents and atmosphere.Many of the observed changes since the 1950s are unprecedented over decades to millennia.Over the last three decades of the twentieth century, gross domestic product per capita and  were the main drivers of increases in greenhouse gas emissions. CO2 emissions are continuing to rise due to the burning of fossil fuels and land-use change.:71 Emissions can be attributed to different regions. Attribution of emissions due to land-use change is a controversial issue.

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