Calculate the resulting CO2 concentration in the atmosphere 30 years from now assuming that we will use only coal to generate electricity. Assume efficiencies of 40% for power plants. Urrent CO2 level in the atmosphere is 370 ppm by volume. Assume that all of the atmosphere's mass is within 11 km of planetary surface and the radius of the earth is 6km. State all your assumptions. Is this a reasonable value? If it is not, state some reasons.