Ineed a starter sentence for my first paragraph why we should keep the earth clean, and how we could do it

We need to keep the earth clean 1 because we live on it.Do you want to live on a planet with trash every were.Even if the dump digs a hole in the ground it will tack a couple of years to break  down. factories mace hundreds of thing think how many hole we will have to dig.

We can stop it by using all of our thing. Don't waste food save it if you don't like it try to give it to the homeless.
hope it helps.

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

How is this a question? where are the answer choices?