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
Recreational use of nitrous oxide Recreational use of nitrous oxide Recreational use of nitrous oxide is the inhalation of nitrous oxide gas for its euphoriant effects. The gas is sometimes called Whippets, Laughing Gas, the Epiphany Drug, or Hippy Crack. In Australia, nitrous oxide bulbs are known as nangs. Nitrous oxide is a dissociative inhalant that can cause analgesia, depersonalisation, derealisation, dizziness, euphoria, and some sound distortion (flanging). In some cases, it may cause slight hallucinations and have a mild aphrodisiac effect. Research has also found that it increases suggestibility and imagination. Inhalation of nitrous oxide for recreational use, with the purpose of causing euphoria