Regardless of the beliefs of the current EPA chief, the vast majority of the scientific community continues to assert climate change is due in large part to carbon dioxide emissions. In 2009, EPA reported 28% of emissions. Now EPA says at least 15 percent of which is attributable to the transportation sector. In short: gas-powered vehicles are killing the Earth.
In fact, the National Resource Council stated that the transportation sector encompasses all movement of people and goods. However, about 28 percent of U.S. greenhouse gas (GHG) emissions are from this sector.
Moreover the overwhelming share of these emissions are from CO2 emitted. That’s as the result of burning transportation fuels. All consequently derived from petroleum (EPA, 2009c). I mean that between 1970 and 2007, U.S. transportation energy use and GHG emissions nearly doubled.
However now, as the USEPA reporting Global Emissions by Economic Sector.
Electricity and Heat Production (25% of 2010 global greenhouse gas emissions): The burning of coal, natural gas, and oil for electricity and heat. That is the largest single source of global greenhouse gas emissions.
Industry (21% of 2010 global greenhouse gas emissions): Greenhouse gas emissions from industry primarily involve fossil fuels. All burned on site at facilities for energy. This sector also includes emissions from chemical, metallurgical, and mineral transformation processes. Those that are not associated with energy consumption and emissions. Either from waste management activities. (Note: Emissions from industrial electricity use are excluded and are instead covered in the Electricity and Heat Production sector.)
Agriculture, Forestry, and Other Land Use (24% of 2010 global greenhouse gas emissions): Greenhouse gas emissions from this sector come mostly from agriculture (cultivation of crops and livestock) and deforestation. This estimate does not include the CO2 that ecosystems remove from the atmosphere. All consequently by sequestering carbon. They sequester in biomass, dead organic matter, and soils. Moreover which offset approximately 20% of emissions from this sector. 
Transportation (14% of 2010 global greenhouse gas emissions): Greenhouse gas emissions from this sector primarily involve fossil fuels. Fuels also burned for road, rail, air, and marine transportation. Almost all (95%) of the world’s transportation energy comes from petroleum-based fuels. That’s also largely gasoline and diesel.
Buildings (6% of 2010 global greenhouse gas emissions): Greenhouse gas emissions from this sector arise from onsite energy generation. In addition to burning fuels for heat in buildings or cooking in homes. (Note: Emissions from electricity use in buildings are excluded. They are also covered in the Electricity and Heat Production sector.)
Other Energy (10% of 2010 global greenhouse gas emissions): This source of greenhouse gas emissions refers to all emissions from the Energy sector. All which are not directly associated with electricity or heat production. That’s such as fuel extraction, refining, processing, and transportation.
Global carbon emissions from fossil fuels have significantly increased since 1900. I mean since 1970, CO2 emissions have increased by about 90%. All with emissions from fossil fuel combustion and industrial processes. Combined thereby contributing about 78% of the total greenhouse gas emissions increases. The years ranges are moreover from 1970 to 2011.
So Agriculture, deforestation, and other land-use changes have been the second-largest contributors.
Because emissions of non-CO2 greenhouse gases have also increased significantly since 1900. To learn more about past and projected global emissions of non-CO2 gases. So please see the EPA report, Global Anthropogenic Non-CO2 Greenhouse Gas Emissions: 1990-2020.