Read the sentences and choose the right missing word

1. There is a list of some common [ ] issues.
2. [ ] emissions are the main cause of pollution.
3. [ ] resources play one of the leading roles in our ecosystem.
4. We should follow [ ] balance to prevent natural disasters.
5. There are so many different types of [ ], such as land, water or air.
6. People have to make some [ ] to the environment to have a better life in the future.
7. Some people think that [ ] makes no sense in European countries.
8. The [ ] of energy and fossil fuels will become lower in 3 years.
9. Volunteering projects and reproduction of [ ] species will be a great addition to local ecological communities.
10. Many [ ] organisations are under pressure because of industrial plants which don't want to follow some European standards.