It's methane. While methane is a more potent greenhouse gas than CO2, there is over 200 times more CO2 in the atmosphere. Eg-CO2 levels are 380 ppm (parts per million) while methane levels are 1.75ppm.Hence the amount of warming methane contributes is calculated at 28% of the warming CO2 contributes. Here is a graph of the various forcings that influence climate (methane is CH4, right above CO2).g-CO2 levels are 380 ppm (parts per million) while methane levels are 1.75ppm. Hence the amount of warming methane contributes is calculated at 28% of the warming CO2 contributes. Here is a graph of the various forcings that influence climate (methane is CH4, right above CO2).
A 25 feet distance is required between the two cones to test  parallel parking skills. The cones are assumed to be parked  vehicles in the test.
Quick Answer. A parallel parking space is widely accepted as approximately 9.1 feet wide by 20 feet long. However, many parallel parking spaces are bigger or smaller in comparison with these measurements. Continue Reading.