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.
Though, in the United States, a parking space 10 feet (3.0 m) deep is uncommon and most parking spaces will be within 16 to 20 feet (4.9â6.1 m), with 19 feet (5.8 m) feet deep being the standard DOT recommended depth for standard perpendicular parking.n the United Kingdom the recommended standard Parking bay size is 2.4 metres (7.9 ft) wide by 4.8 metres (16 ft) long. Recently there has been some controversy about most UK parking spaces being too small to fit modern cars, which have grown significantly since standards were set decades ago.