Question

what do they think about resources they use

Answer 1

The Earth is a closed system. For our examples, we need to think that nothing comes in (except energy) and nothing goes out (except energy). Even the amount of energy that moves in and out of the Earth is equal. If more came in than was released, we would heat up. If the Earth gave off more energy than it received, we would cool down. The smarties in the crowd are saying "What about meteorites?" Yes. There are small amounts of matter hitting the Earth from space. On the other hand, we are sending more satellites and spacecraft into orbit. A little is being lost too.