Walls along water bodies do increase speed and amount of water downstream.
“Will make things worse for sure”. 
What’s the correct amount of CO2 and, of course the desirable temperature (air and water bodies, and please, state all the water bodies because they vary). Oh by the way, you may synchronise it with solar activity, geothermal activity and other factors that the CO2 cult do not factor… 
Hope you have a good thermostat, good luck with that 👍 👋