A new report from the UN Environment Programme says even if all countries strictly adhered to their current pledges to cut down greenhouse gas emissions, it would still not be enough to keep the global average rise in temperatures to below 2 degree Celsius compared to pre-industrial times, as is required to avoid catastrophic impacts. The report, released at the climate change conference here, says if all the emission reduction targets were met, the annual global emission of greenhouse gases in 2020 would be about 49 billion tonnes of CO2-equivalent. This is about 5 billion tonnes more than what science says is the level where the annual emission should be in 2020 if there has to be any chance of keeping the temperature from rising above 2 degrees Celsius. The current annual global emissions are estimated to be about 46 billion tonnes of CO2-equivalent. If the pledges are implemented in a