Every one can think about following this

• Plant  trees for every birthday, the number of trees you plant must be equal to the age you celebrating. (e.g. 10th birthday 10 trees, 11th birthday 11 trees, at 10th birthday your total number of trees would be 1+2+3+4+.....10 = 55). I`m sure before you die you might have contributed invaluable resource to the next generation.
• Reduce, Reuse, Recycle. although you might have heard all around, but the seriousness to include in our life has not started yet.
• Curiosity searching for water on mars. we have water on earth are we taking care of it?
• Earth like planets might have been found earlier or may be many more will be discovered in the future. but, THERE IS ONLY ONE EARTH. NO SUBSTITUTES.