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This Earth is our only home. Together, we must protect and cherish it.

We survived on natural resources, so we should take care of the earth. When I leave home, I do things like switching off the heat and lights.

The Earth is a beautiful planet. The space station is a great vantage point to observe it and share our planet in pictures. It makes you more of an environmentalist.

Earth Day should encourage us to reflect on what we are doing to make our planet a more sustainable and livable place.

I feel very passionately that we need to take care of the planet and everything on it. Whether it's saving the Amazon or just being kind to those around you, we need to take care of each other and Mother Earth.

Earth as an ecosystem stands out in the all of the universe. There's no place that we know about that can support life as we know it, not even our sister planet, Mars, where we might set up housekeeping someday, but at great effort and trouble we have to recreate the things we take for granted here.

We live in the best place on earth but at times the worst.

We do care about planets like the Earth because by now we understood that life as a chemical system really needs a smaller planet with water and with rocks and with a lot of complex chemistry to originate, to emerge, to survive.

I believe we should be good custodians of the Earth.

Our meaning is to make our little planet Earth a better place to live, to stop wars, disarm nuclear missiles, to stop diseases, AIDS, plague, cancer and to stop pollution.