Answer:
1. using water at a rate at which it will be replaced by precipitation or through recycling
2. cutting down trees at a rate that ensures they will be replaced by new growth meeting current needs without reducing the ability to meet future needs
Explanation:
1 and 2
Sustainable development involves usage of resources at a rate with which it can be replaced and number 1 and 2 are good examples of that.
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earth is round because of gravity
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