Answer:
Waste heat from energy convertion plants has led to national warming.
Explanation:
Waste heat from the above plants are emitted directly into the environment, this heat does not become extinct, it becomes part of the environment causing a warming effect, and a negative change in the climate.
Further Explanation
Other than the above cause, global warming also contributes to the warming of the enviroment.
Measure the amount of certain radioactive elements in the rock when rocks are formed, small amounts of radioactive elements usually get included as the rock ages, more and more of the uranium changes into lead.
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