1- 25 per cent of the world's population 80 per cent of the planet's resources.
2- The company is trying to increase the of wind energy so that it can provide more consumers with sustainable power.
3- Solar energy is very clean. If our town was powered by solar energy, the of pollution would be significant.
4- According to the experts' oil will run out in the near future.
5- Cars and factories are resposible for much of the that we have in our cities.
6- A: We cannot the effects of global warming, it's too late.
B: Oh, don't be so negative!