CO2 emissions as a share of total worldwide CO2 emissions fell 2.08% to 15.2% in the USA in 2017, according to World Bank / EIA.
Historically, CO2 emissions as a share of total worldwide CO2 emissions in the USA reached an all time high of 31.4% in 1968 and an all time low of 15.2% in 2017. When compared to USA's main peers, CO2 emissions as a share of total worldwide CO2 emissions in Canada amounted to 1.67%, 27.6% in China, 3.52% in Japan and 1.42% in Mexico in 2017.
USA has been ranked 2nd within the group of 79 countries we follow in terms of CO2 emissions as a share of total worldwide CO2 emissions.
| CO2 Emissions (As % of Total Worldwide CO2 Emissions) | Unit | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 |
| Australia | % | 1.26% | 1.23% | 1.20% | 1.21% | 1.24% | ||||||||||||||||
| Belize | % | 0.002% | 0.001% | 0.002% | 0.002% | ... | ... | ... | ||||||||||||||
| Canada | % | 1.66% | 1.59% | 1.61% | 1.64% | 1.61% | ||||||||||||||||
| China | % | 27.5% | 27.7% | 28.1% | 28.0% | 27.9% | ||||||||||||||||
| Guatemala | % | 0.037% | 0.037% | 0.042% | 0.056% | ... | ... | ... | ||||||||||||||
| Honduras | % | 0.028% | 0.028% | 0.028% | 0.029% | ... | ... | ... | ||||||||||||||
| India | % | 5.43% | 5.73% | 5.89% | 6.34% | 6.53% | ||||||||||||||||
| Japan | % | 3.73% | 3.97% | 3.89% | 3.75% | 3.64% | ||||||||||||||||
| Mexico | % | 1.46% | 1.47% | 1.45% | 1.40% | 1.39% | ||||||||||||||||
| Russia | % | 4.87% | 4.86% | 4.65% | 4.66% | 4.55% | ||||||||||||||||
| South Korea | % | 2.02% | 1.99% | 1.97% | 1.96% | 2.00% | ||||||||||||||||
| USA | % | 16.8% | 16.0% | 16.2% | 16.3% | 15.9% | ||||||||||||||||
| United Kingdom | % | 1.55% | 1.58% | 1.52% | 1.39% | 1.33% |
Helgi Library 
