Green Car Congress

JUNE 12, 2023

Unlike exhaust from burning coal and gas that contains CO 2 , burning hydrogen emits only water vapor and oxygen. Hydrogen is not a greenhouse gas, but its chemical reactions in the atmosphere affect greenhouse gases such as methane, ozone, and stratospheric water vapor. Sand et al.

Hydrogen 435

Hydrogen Global Ozone CO2 435

Green Car Congress

APRIL 29, 2013

(The figure includes the direct effects and those indirect effects due to the production of tropospheric ozone and stratospheric water vapor.) In 2011, CH4 emissions from coal mining were 63.2 Routine maintenance emissions originate from pipelines, equipment, and wells during repair and maintenance activities. Tg CO 2 Eq., Tg CO 2 eq.

2007 285

2007 2011 EPA Gas 285

Green Car Congress

JULY 29, 2010

Soot—black and brown particles that absorb solar radiation—comes from two types of sources: fossil fuels such as diesel, coal, gasoline, jet fuel; and solid biofuels such as wood, manure, dung, and other solid biomass used for home heating and cooking around the world. Particle traps filter out soot particles from exhaust fumes.

Global 230

Global Ozone CO2 Pollution 230