When it is hot, we use more power to stay cool.
When it is dry, we use more water to keep the landscape alive.
Power production uses a lot of water.
The treatment and pumping of water consumes a lot of power.
Producing more power, particularly when it is coming from burning coal, puts more pollution in the air.
When it's hot, those pollutants react in the atmosphere and form ozone, which can cause damage to lungs and air passages.
As water supply dwindles and heat rises, it becomes harder to use that water in the power generation process.
All that adds up to a more quickly depleted water supply and higher levels of ozone in the air.
So, if you can find ways to save energy, drive less or use less water, do.