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.
Parallel parking is generally used next to a curb in the space between two parked cars. Find a place which is at least 5 feet longer than your car. It requires practice to master this maneuver, but sometimes it is your only choice. Be attentive to the place where you leave your car. There are a lot of restrictions about parking, and you have to keep in mind the pavement marking rules and your state's traffic laws and know what circumstances won't allow you to park in some areas. 1  Angle Parking.