The Kyoto Protocol is a 1997 international treaty, a voluntary involvement to reduce GHG emissions.
The Kyoto Protocol is a 1997 international treaty aimed at reducing greenhouse gas emissions that contribute to global warming. The protocol called for 41 countries and the European Union to cut emissions of six greenhouse gases by 5.2 percent below 1990 levels.
The Kyoto Protocol is a voluntary agreement in which state parties agree to reduce greenhouse gas emissions.
Therefore, option b explains the Kyoto Protocol.
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