Being "Green" and using computers

Do you think the computer industry has more of a positive or negative effect on preserving global ecosystems? I believe the effect is positive, because in ways it doesn't hurt or harm the ecosystem as much as other things do, like;gas, industrial sites, how people stash their waste products,etc. Ways we could be "green" using our computer and internet? well we could encourage others through internet by posts, websites, videos, blogs, etc. And we could recycle the broken down or no longer used hard-wares. These are only a few things that come in to mind. But it'll take more to be environmental friendly.