Nature or more precisely the biosphere and the atmosphere provide all our needs. Rapid urbanization has created a disconnect among some humans and the natural world. This prevents us from realising that the real world is in Nature.
Sunlight is converted into chemical energy by green plants. Green plants produce and store in excess of their needs. Animals eat the stored food and get energy from green plants.
Humans are animals with more abilities than most other animals. This extra ability has been used to extract benefits from nature. However the rate at which we are extracting benefits is greater than the rate at which Nature can replenish itself.
This tilt will mean that we will reach a tipping point and doom ourselves to destruction. To avoid this we must protect Nature.