· The best non renewable resource we have for energy has been oil and gas, and nuclear fission has been fantastic. About 80% of all the electricity generated and used in France comes from nuclear fission, but they are the only country to go this far. These energy sources leave a legacy of problems. Oil and gas leave carbon in the atmosphere that can affect the climate, and fission leaves very long-lived waste which is a problem. Fusion holds the promise of a much cleaner energy in that it is almost unlimited in fuel, and does not appear to leave any waste lasting more than about 50 years to worry about. However fusion only works in very big machines, so we will not be seeing a Delorean powered by fusion as in Back to the Future for a while yet unless we make a startling new discovery. Hope this helps. regards Robin
Because a lot of people in developing countries can’t keep their food fresh, and can’t store important medicines. If we make a fridge that runs just using heat from the sun then they will be able to store a little food for longer, and have a cooled village medicine cabinet which may end up saving someone’s life one day.