carbon dioxide

Thecarbon dioxide (abbreviated CO2) levels in the atmosphere have been steadily and measurably rising for many centuries and are now at their highest level in over 650,000 years. All animal life exhales CO2. For non-political implications of the gas itself see carbon dioxide.

Combustion in human industry, transport but also forest fires and deep plowing have led to higher concentrations of CO2 in the atmosphere. Plowing leads to methane which has more intense greenhouse gas effects, combustion creates carbon monoxide which is toxic, and sulphur dioxide which causes acid rain.

Whatever the causes, the rise in CO2 has two distinct and dangerous effects:

CO2 is the greatest greenhouse gas emitted by humans and forms the dominant part of any GHG quota. There apparently is thought to be little need for any separate measure to control CO2 for ocean acidity purposes, the UN Framework Convention on Climate Change and the Convention on Biological Diversity deal with carbon dioxide issues comprehensively and protect reefs either direclty or by implication.