Climate change is still real, still happening and still terrifying, but thankfully it looks as if the US and China are listening to the UN's advice. The pair has announced a historic pact that sees both nations agreeing to begin reducing their carbon emissions by 2030 at the very latest. The US is going further, pledging to reduce its emissions by up to 28 percent of 2005 levels - which would bring annual emissions down from six billion tonnes per year to just over four. China, on the other hand, is promising to "peak" its emissions by 2030 or earlier, meaning that the number will start to fall after that point. The downside of that, of course, is that China could be pumping up to 12 billion tonnes of CO2 before it starts to make a dent.