For smaller lakes and rivers, reduced flows are likely to cause water quality issues to become more acute. In addition, the projected increase in very heavy precipitation events will likely lead to increased flash flooding and worsen agricultural and other non-point source pollution as more frequent heavy rains wash pollutants into rivers and lakes.
And what to do about it - from the NARP:
“By how much does transit reduce carbon emissions?” Transit directly saves 6.9 million metric tons annually. Taking into account indirect savings, this number jumps to 37 million metric tons.