Match the two parts of the sentences.


Enter your answers in the gaps. When you have entered all the answers, click on the "Check" button.
   chain      development      energy      habitat      warming      world   
1. The burning of fossil fuels leads to global .
2. Insects are an essential part of the food .
3. We need to develop new forms of renewable .
4. The sight of these animals is one of the wonders of the natural .
5. It's important to preserve the otter's natural .
6. The government is promoting sustainable .