An increase in insulating atmospheric gasses (e.g. carbon dioxide)
Think about skin cells. Skin cells shed every day, if cell division didn't take place, you would just constantly be losing skin cells.
They build more houses and more factories to produce more goods for the population also including more vehicles for more income of people buying them. Stores and etc.
A chromosome is a packaged and organized structure containing most of the DNA of a living organism. Messenger RNA is a large family of RNA molecules that convey genetic information from DNA to the ribosome, where they specify the amino acid sequence of the protein products of gene expression. Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues.