An international group of environmental organizations on Thursday awarded Japan a "Fossil of the Day" award for its failure to make sufficient efforts to fight global warming.

The Climate Action Network said Japan is "blocking a proposal from G-7 countries" to craft eco-friendly investment standards for development banks, including the World Bank and the Japan Bank for International Development.

Japan expressed opposition to putting such unified standards in place, and the proposal has been dropped from a draft statement for the Group of Seven summit that begins Sunday in Germany, according to sources.

Such investment standards would pose an obstacle to Japan's push to sell coal-fired thermal power generation equipment to developing countries.

The environmental group also cited Japan's emissions cut target of 26 percent by 2030 from 2013 levels, decided Tuesday, as "extremely weak."

Japan previously has received several "Fossil of the Day" awards for not doing enough to fight global warming.