Nowadays, a lot of people use gadgets, cars ( for example, two or three cars for one family) and less of us think about the nature.
Gadgets, cars, machines and waste products spoil Earth, which is actually our real home.
If we won't take care about ourselves and each other, the air will be dirty and there will be no oxygen, water will have a lot of mud so we just kill ourselves and moreover others member of our huge ecosystem.
I talk about animals and plants, fish and birds, they all are our friends.
As for me, Greenpeace actually do a lot, but if everyone will take care about ecology, such organizations like Greenpeace just will disappear.