Dams cause the currents to take a unnatural pattern leading to the seas changing current and being warmer/colder than usual
Agriculture means that forests are being cut down to make space for fields and this effects the temperature and the water level of the world.
Deforestation is also causing water levels to rise and heat of the earth to go up. Not only that but they are being burnt as coal producing more Co2 meaning the greenhouse gases go up casing the ice caps to melt going back to the water level rising.
Credits:
Created with images by Disco-Dan - "Forest Harvesting (22)" • Phil Roeder - "Dam" • Richard Allaway - "Desert agriculture"