In today's world, we were faced with a problem for very long. Although this will not be resolved easily, but it can mitigate the global warming problem.
In today's world we are faced with the problem of global warming for a long time. Although it can not be resolved easily. But you can mitigate global warming.
At present, the world has faced with the problem of global warming for a very long time. Although it can not solve the problem easily. But it can relieve the problem of global warming.