Global heating is still international problem with air pollution ,flooding and overheating in the world and big countries like USA,China and Russia are still polluting air by greenhouse gases.Key portions of the Kyoto Protocol are set to expire at the end of 2012. But many of the world's major greenhouse gas emitters have already set national targets to reduce emissions, and they're forging their own initiatives to meet those goals.
Some are focusing on curbing deforestation and boosting renewable energy sources. Several nations are experimenting with cap-and-trade plans: Regulators set mandatory limits on industrial emissions, but companies that exceed those "caps" can buy permits to emit from companies that have allowances to spare. In some cases, it's not clear that countries are doing much to meet their stated climate goals. What is clear is that the pledges currently on the table aren't legally binding, and they fall far short of what would be required to stabilize the planet's atmosphere.
So why these countries not to stop pollution?