2015 State of the Climate: Carbon Dioxide

Carbon Dioxide Center for Science Education

Does the air become noticeably fresher in the spring/summer when the leaves bloom since they make oxygen? - Quora

Analysis: Which countries are historically responsible for climate change? - Carbon Brief

Climate Change Indicators: Ocean Acidity

The U.S. Military Emits More Carbon Dioxide Into the Atmosphere Than Entire Countries Like Denmark or Portugal - Inside Climate News

Are living trees and plants in cold regions measurably warmer in temperature than dead trees or plants in the same region? - Quora

21 Countries Are Reducing Carbon Emissions While Growing GDP - Ecosystem Marketplace

Where Carbon Is Taxed (Overview)

Does the air become noticeably fresher in the spring/summer when the leaves bloom since they make oxygen? - Quora

EIA projects that U.S. energy-related CO2 emissions will fall through 2050 in AEO2023 - U.S. Energy Information Administration (EIA)

ESRL Global Monitoring Laboratory - Mauna Loa Observatory