Mostly, when we talk of technology in terms of the environment, we only talk of how it has destroyed the earth's environment. Ofcourse we do not even talk of how scientists have been working technology to help save the environment as well.
One of the things that the scientists have been doing, and yes, it might sound quite childish, but it might actually help us, is that they have been trying to kick up the dust from the moon surface so as to make a protective cover around the earth which will inturn help it from the suns harmful rays.