Vocabulaire anglais : The environment

Complete the sentences using the appropriate vocabulary related to the environment. Choose from these words: recycle, pollution, waste, energy, planet.

1. We must reduce the amount of $CO_{2}$ in the atmosphere to fight against global warming.
2. It is important to __________ paper and plastic to protect our __________ Earth.
3. Plastic __________ in the oceans is a major threat to marine life, causing a loss of biomass estimated at $10^{6}$ tons.
4. Turning off lights helps to save electrical __________ to limit the output of power plants measured in $kW$.