Information from the Japan Center for Climate Change Actions shows that in 2015 most CO2 emissions came from the electricity generating sector and from industry, with 39 and 32% respectively. Transportation is another large contender at 17% of the total CO2 emissions.
[Based on information from http://www.jccca.org/chart/chart04_04.html]
In 2011 Japan suffered the great east Japan earthquake and tsunami, which greatly affected the total power consumption and availability of energy resources, as most nuclear power plants were subsequently shut down in order to conform to stricter safety norms. Previously, in 2010, around half of the energy used during electricity generation was lost. Another main wasteful sector was transportation.
Energy Flow in Exa-Joules in Japan in 2010
[From Koyama et al, 2014, DOI: 10.1252/jcej.13we345]
The differences in energy sources between 2010 and 2014 are shown below (2010: inner ring, 2014: outer ring). Ideally international aviation and shipping are also included in a countries' energy flows, as they can be a large share of the total energy flow.
[Based on information from http://www.enecho.meti.go.jp/about/faq/001/]
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