Before the 19th-century Industrial Revolution, the average carbon dioxide concentration worldwide was about 280 parts per million.
Car exhaust emissions in the U.S. account for 5% of worldwide carbon emissions.
Mr Brown called for a long-term framework of a worldwide carbon market that would lead to "a low-carbon global economy".
The last time the worldwide carbon level probably hit 400 ppm was about 2 million years ago, said Pieter Tans of the National Oceanic and Atmospheric Administration.
The last time the worldwide carbon level was probably that high was about 2 million years ago, said Pieter Tans of the National Oceanic and Atmospheric Administration.
He believes we can meet worldwide housing demand AND constrain carbon emissions by replacing steel and concrete construction with wood construction, that can even be applied to skyscrapers.
The new study aligns with a claim made Wednesday by the International Energy Agency that if the planned expansion of nuclear power worldwide is reduced by half, global carbon emissions will increase by 30 percent.
FORBES: Shutting Nuclear Plants Would Boost Coal And Carbon Emissions
Global warming will shift from vague concern to serious business opportunity, as local and national governments worldwide use taxes, regulations and incentives to push less carbon dioxide-intensive technology.
Gas flaring (burning off natural gas released by oil drilling) in the delta produces 70 million metric tons of carbon emissions a year -- "a substantial proportion of worldwide greenhouse gas, " according to the World Bank.
Calculate carbon emissions for a road trip or flight and buy offsets to fund worldwide projects that employ those in poverty, such as tree-planting programmes that hire low-income workers, or projects that help both the poor and the environment by distributing fuel-efficient stoves, as opposed to wood-burning ones used in most homes in developing countries.
These benefits, in combination with growing electricity use worldwide, concerns about limited supplies of fossil fuels, and efforts to reduce carbon-dioxide emissions and prevent climate change, have prompted governments and investors to pour money into this emerging technology.
Colin Masson, worldwide director for ERP and supply chain, Microsoft: Beyond the direct energy and carbon footprint benefits that can be attained by migrating existing IT to the cloud, it is also a key enabler of sustainable supply chains.
If successful, the firm believes this type of system could form part of a new approach to sustainable farming, making use of urban greenbelts while helping to reduce the carbon footprint associated with food production -- which accounts for up to 30% of total emissions worldwide, according to a 2008 Greenpeace report.
Current projections show a near tripling of carbon dioxide emissions from electric power in developing countries during the next 20 years, which represents 10 percent of worldwide projected emissions.
CNN: Developing countries encouraged to curb greenhouse gases
If greenhouse-gas concentrations are to be stabilised, then the carbon price or the support mechanisms for clean energy, or both, will have to rise or be adopted worldwide, or both.
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