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Global warming is the rise in the average temperature of Earth’s atmosphere and oceans since the Industrial revolution.
The unequivocal effects of greenhouse gas emission–induced change on the climate system, reported by IPCC’s Fourth Assessment Report (AR4) in 2007, have continued to intensify, more or less unabated;
The concentration of the main greenhouse gas, carbon dioxide (CO2), has continued to increase from its preindustrial concentration of approximately 278 parts per million (ppm) to over 391 ppm in September 2012, with the rate of rise now at 1.8 ppm per year.
Global mean temperature has continued to increase and is now about 0.8°C above preindustrial levels.
The world bank in its recent report cautioned the world community on the dangerous consequence of increase in the global mean temperature. The climate change due to global warming is expected to effect the sea level rise, food production, health and the way we live in this world
Without further commitments and action to reduce greenhouse gas emissions, the world is likely to warm by more than 3°C above the preindustrial climate. Even with the current mitigation commitments and pledges fully implemented, there is roughly a 20 percent likelihood of exceeding 4°C by 2100. If they are not met, a warming of 4°C could occur as early as the 2060s. Source: Turn Down the Heat, The World Bank