Katsumasa Tanaka works at the Laboratoire des Sciences du Climat et de l’Environnement, near Paris in France, funded by the Make our Planet Great Again prpgramme (https://makeourplanetgreatagain-cnrs.com/) and also at the National Institute for Environmental Studies, Tsukuba, Japan. His field of research is on integrated assessment modeling, with the ACC2 model (https://doi.org/10.1038/s41558-018-0097-x).Katsumasa Tanaka contributes to the CarbonMonitor initiative by providing and analyzing electricty and road traffic data from Japan