Is freshwater a renewable or non renewable resource?

Answer 1

Strictly speaking, it is non-renewable because water is a simple molecule and there is not much hydrogen around to combine to oxygen and make new water. However, at the local level it is often considered that water is renewable because the global hydrological system is immense so the flows are such that water is generally locally replenished everywhere. But if you inject water deeply underground (like it is done with wastewater from heavy industrial processes) or send it to space (hypothetically) then the water is out of the global hydrological system so it's kind of a non-renewable use of water.