Which element is the biggest contributor to Climate Change?

carbon dioxide (CO2)

Explanation:

the burning or combustion of these fossil fuels creates gases that are released into the atmosphere. Of these gases, carbon dioxide (CO2) is the most common and is the gas most responsible for exacerbating the green- house effect that is changing global climate patterns.

i think the answer would be reserve.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.