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.
A: For parallel parking, set cones 25 feet apart and 7 feet away from the curb. Place one cone in front of the car and two behind. The most effective way to master parallel parking is to practice. Many behind-the-wheel driving tests use cones. To begin, set up the cones in a deserted lot or very quiet street with little traffic. A spot that is 5 feet longer than your vehicle is ideal for practice.