I think that humans should keep building dams if they are needed. Some good things are that dams control the flood waters of rivers. This makes it so that we can protect our major cities and keep the economy from a huge downfall. Another reason would be that dams provide almost 12% of the power in the U.S. this makes it so we can rely less on fossil fuels and stop burning things. This helps the environment and slows global warming. The last positive thing would be that dams create reservoirs which help with water storage. If there is a dry season and the river starts drying up then the reservoir would provides months of good water. This makes it that so even in a drought people can carry on with their regular lives and wouldn't have to go on water rations. Some negative things would be that dams displace many people that live in the area that the reservoir would occupy. It also destroys some animal habitat and can put some species in danger. For example in China on the Yangtze river they built a dam. That dam created a barrier making it so many fish could not swim up stream to spawn and it covered much of the endangered Baiji Dolphins natural habitat putting them in even more danger of becoming extinct. Over all there are many positive and negative things about dams. But there could be very severe consequences and loss of lives if we stop building dams to save our major cities.