Since greenhouses are designed to trap in heat, we call global warming the “greenhouse effect” because it essentially does the same thing. “Greenhouse” gases (gases that easily trap heat) clog up the outer layers of the atmosphere and prevents heat from leaving the planet. The gases trap heat, just like greenhouses.
The answer is 4 million, there are about 9-10 million unique organic compounds that are known to exist
Epsilon-delta would be the green letter that is used in the precision definition of a limit. (ε, δ).
Boiling points are a measure of intermolecular forces. The intermolecular forces increase with increasing polarization of bonds. Boiling point increases with molecular weight, and with surface area.