Contamination. In my opinion, this is one of the most pressing issues right now, so I would think that if we moved, this problem would at least be addressed. Food contamination has been reduced, and there is a greater appreciation for fruit and vegetables grown in nature without fertilisers and various pesticides. As far as machine pollutants are concerned, various fuels would be invented that not only do not pollute the environment, but also destroy the pollution so that it is possible to return later. The pollution of nature from all sorts of means: burning bonfires, the effects of war, etc. This could be tackled, but the means have not yet been found. It is a difficult and tedious process, but in a couple of decades, the means will have been found to eradicate pollution. Everyone will see pollution as a serious problem that needs to be tackled without delay, and a place for new products to be found. So there will be many new ideas worthy of funding to solve the problem, and it will take a lot of testing and trust to come up with a fuel that will reduce pollution. It will take many years to find the right tool to enable more sustainable driving. Pollution-free food will be much better than any before and will not spoil so quickly, but neither will it taste like plastic. Well, the damage to the environment will still be a sensitive subject, but it is already being addressed and will be the subject of significant funding.