6. Some farmers are overusing chemicals in their crops.
Chemicals are overused by some farmers in their crops.
7. Europe was consuming too much oil when the economic crisis broke out.
Too much oil was used by Europe when the economic crisis broke out.
8. Environmentalists were saving endangered species after the oil spill.
Endangered species were saved by environmentalists after the oil spill.
9. Climate changes have caused the rise of temperature in many areas.
The rise of temperature is the consequence of climate changes in many areas
10.Deforestation has destroyed some rainforest ecosystems.
Some rainforest ecosystems were destroyed by deforestation.