greenhouse effect• In comparison, Venus experiences a greenhouse effect of over 500 °C while Mars has a smaller greenhouse effect of 10 °C.• However, emissions of NOx gases in the upperatmosphere have a greenhouse effect 100 times more powerful than C02.• Nitrous oxide Six percent of the currentgreenhouse effect.• This is the well-knowngreenhouse effect.• Neither can we guarantee that everywhere on Earth will be warmer as the greenhouse effectprogresses.• They contribute 14 percent of the greenhouse effect and are increasing at the rate of 6 percent a year.• The answer is that the greenhouse effect is very weak on Mars.• Robert Maxwell reassuredshareholders and the world at large that he had turned his giantmind to the greenhouse effect.