Well I can't write an essay but I can give you some points:
-Renewable electricity isn't much(1 wind turbine can only power THREE houses)
-It looks really ugly(Just imagine a beautiful bay then you stick some wind turbines in the sea and it instantly looks ugly)
-Too expensive to build(solar panels are not cheap)
There's also another reason I didn't write your essay, it's because I suck at writing essays. I always end up putting a bunch of fancy and bombastic words that the teacher doesn't understand so she marks it wrong. I'm really sorry!
Other modern examples of totalitarian states include the Soviet Union under Joseph Stalin, Nazi Germany under Adolf Hitler, the People's Republic of China under Mao Zedong, and North Korea under the Kim dynasty.
A large area of flat land, that is at a high altitude is called a plateau. An excellent example of a plateau is Tibet.
Convection is correct i think