That is, the warmer the air temperatures get, the more water the air can hold, and thus more clouds can occur. More clouds means more reflection of solar energy into space and therefore less energy for evaporation, means fewer clouds. What can change the climate though, is when uneven heating and cooling causes more or fewer clouds in some areas but not others. I n spite of what some people say, humans do cause climates to change. They do so by altering the ground.
Cities are generally warmer than the surrounding countryside.
It is because people have paved over the grass, and drive cars and build factories that produce heat. Factories and cars and even people produce more heat. All this heat piles up over the city, making what is known as an urban heat island . Outside the city, rural areas can experience changes in climate as forests are cleared and agricultural crops are planted. All this human activity on the Earth's surface can change climates.