I am very concerned about the effect of Global climate change. There are a lot of people in the world and we are on the limit of growing enough food at the moment. If the climate changes this could have a dire effect on the amount of food we could grow somewhere.
A fusion reactor would reduce the amount of oil, coal and gas we burn to make electricity, so that would be really good for the environment.
Most engineers make really important contributions to improving the world, whether it be through improving water supply, transport links, energy security, or just making a better light bulb, so I think engineering in general is important. But there are lots of other things in life that are important to different people and you shouldn’t let work take over those things.