Here's a small way to contribute something to saving our world.
Just change your default search engine to Ecosia, and every search you do will save two square metres of rainforest.
It may not sound like much, but the power of habit always has a big impact, over time. Just imagine how many times you search for something on the net every day, week, month, year - and if you spread the word and just one of your friends starts to use it, and then convinces just one of his or her friends to also start using it every time...
And why stop now? There are hundreds of other habits that can be added to your routine, e.g. why not try: eating vegetarian food once a week, take the stairs instead of the elevator every day, smoke one less cigarette than you did the day before, turn off your TV once a week and use the time to read or spend the time with someone you like.
All journeys start with a single step, repeated until you're there! :)