Greenhouse gas systems. Future warming is projected to have a range of impacts, including sea level rise, increased frequencies and severities of some extreme weather events, loss of biodiversity, and regional changes in agricultural productivity. The main sources of greenhouse gases due to human activity are: The seven sources of from fossil fuel combustion are (with percentage contributions for 2000–2004): Carbon dioxide, methane, nitrous oxide () and three groups of fluorinated gases (sulfur hexafluoride (), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs)) are the major anthropogenic greenhouse gases, and are regulated under the Kyoto Protocol international treaty, which came into force in 2005. Emissions
Emissions Trading Scheme in South Korea in the scheme: Carbon Dioxide, Methane, Nitrous Oxide, Hydrofluorocarbons, Perfluorocarbons, and Sulfur hexafluoride. More than 525 business entities are subject to the ETS with specific emission targets set for each sectors. Similar to that of the European Union, South Korea has divided its emissions trading scheme into three phases. With differing time spans and targets within each phase. The country is currently in its first phase which started in 2015 and lasts until 2017. The second phase occupies a 3-year-span from 2018 to 2020 and the final third phase is from 2021 to 2025. During Phase 1 all permits will