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"When we talk about greenhouse gases we usually talk about carbon dioxide. When media reports depict climate change, we invariably see the cooling towers of a coal power station. Which is fair, because carbon dioxide, or CO2, is the big one: nearly 75% of Australia's total greenhouse gas emissions are carbon dioxide. Most of those come from the energy sector and the combustion of fossil fuels. But there are other gases involved in the greenhouse story. Methane and nitrous oxide are also contributors to Australia's greenhouse gas account. And both have a much greater impact on the atmosphere in terms of global warming than carbon dioxide."

"Remember carbon capture and storage? Five years ago, the idea of grabbing the carbon dioxide from coal and gas power plants and burying it deep underground was considered an essential technology for curbing the world's greenhouse-gas emissions. A diagram of how various sorts of carbon capture might work. (Congressional Budget Office) But carbon capture hasn't fared well in the years since. Since 2008, world governments committed at least $25 billion to fund large-scale demonstration projects, the Financial Times reports. And we have remarkably little to show for it so far."

One of the world's most complex experiments on the impact of rising levels of carbon dioxide is taking shape in eastern Australia, where giant steel frames nine stories high have been built on native woodland.  The project near Sydney will mimic future climatic conditions by simulating higher atmospheric concentrations of carbon dioxide. Carbon dioxide is pumped into an environmental "time machine" on the outskirts of Sydney, aiming to predict how vegetation will react to future climate change.

At the Mauna Loa Observatory in Hawaii, the latest on-site measurements of carbon dioxide in the atmosphere by the Scripps Institute of Oceanography reveal that global atmospheric carbon-dioxide (CO2) concentrations reached 391.3 parts per million (ppm) in 2011, up from 388.56 ppm in 2010 and from 280 ppm from pre-industrial times. According to the Intergovernmental Panel on Climate Change (IPCC), in order to have a 90-percent chance of avoiding dangerous changes in climate, greenhouse-gases (GHGs) concentrations need to be stabilized at 450 ppm, which would roughly translate into an average temperature increase of 2° Celsius. This means that to stabilize GHG concentrations at 450 ppm, global GHG emissions will need to peak before 2015 and be reduced to 50 percent of their 2000 level by 2050.

A study has found that increased levels of carbon dioxide in the atmosphere can reduce the amount of water plants need to grow. Carbon dioxide concentrations recently exceeded 400 parts per million for the first time in three million years. But researchers at the Australian National University say the benefits of higher CO2 levels could partially offset some of the negative affects of climate change.

"You want to know what the biggest obstacle to dealing with climate change is? Simple: time. It will take decades before the carbon dioxide we emit now begins to have its full effect on the planet's climate. And by the same token, it will take decades before we are able to enjoy the positive climate effects of reducing carbon-dioxide emissions now. "

"Global greenhouse gas emissions from burning fossil fuels reached the highest levels in human history last year, driven predominantly by Chinese growth, and are projected to surge even further in 2013. New data from the Global Carbon Project - a team of international scientists who track global emissions - finds carbon dioxide released from burning fossil fuels and making cement grew 2.2 per cent in 2012 from the previous year. In 2013 a further 2.1 per cent rise is expected. But the latest data suggests the world's emissions could be slowing. The approximate 2 per cent growth in 2012 and 2013 falls short of the 3.1 per cent average annual rise since 2000. CSIRO climate scientist Dr Pep Canadell - who is also executive director of the Global Carbon Project - told Fairfax Media the emissions rates of the past two years could be the tentative signs of a global slow down."

"Our ability to harness ever-expanding amounts of data is completely transforming our understanding of environmental problems and solutions. Our Climate Insights blog series leverages data from CAIT 2.0, WRI's climate data explorer, to shed light on the many dimensions of climate change that shape society, policy, and global development."

"One evening in the small village of Ashton Hayes in Cheshire, England, someone started a conversation about climate change and energy at the local pub. It was 2005. Two years later, residents had cut their carbon dioxide emissions and energy costs by 20 percent. Ashton Hayes now aims to be England's first carbon-neutral community."

Which countries in the world emit the most carbon dioxide? How fast has China overtaken the US to reach the number one position? And why does Gibraltar have such high emissions per person? This interactive guide made for us by Craig Bloodworth of the Information Lab gives you a way to navigate the latest Energy Information Administration data

"Global warming's maths means Australia really counts It's simple maths: we can burn less than 565 more gigatons of carbon dioxide and stay below 2°C of warming - anything more than that risks catastrophe for life on earth. The only problem? Fossil fuel corporations now have 2,795 gigatons in their reserves, five times the safe amount. And they're planning to burn it all - unless we rise up to stop them."

Last week the world's atmosphere took a giant leap backward. For the first time in more than 3 million years, the atmospheric concentration of carbon dioxide (CO2) reached 400 parts per million. This was recorded at the National Oceanic & Atmospheric Administration's Earth System Research Laboratory located on Mauna Loa in Hawaii right out in the middle of the Pacific Ocean, a long way from major sources of CO2 in Asia and North America. What this means for the environment is uncertain but it's likely that, if no measures are taken to reduce this level of greenhouse gas, we could be headed for 3-4 degrees C warming globally by the end of this century

"The Clean Energy Bill 2011 is a package of legislation that establishes an Australian emissions trading scheme designed to reduce carbon dioxide emissions and limit global warming"

"Australia is getting wetter despite drought across much of the country, a climate report has revealed. The CSIRO and Bureau of Meteorology's latest State of the Climate report is a snapshot of how Australia's weather has changed over the last two years." This is the ABC report including video and downloads

"The science behind what makes our planet's temperature rise is pretty straightforward. Pollutants like soot and greenhouse gases like methane and carbon dioxide trap heat within the earth's atmosphere, the global average surface temperature goes up, ice caps melt, sea levels rise and extreme weather events become even more extreme. However, American college students are coming with with some of the coolest ways to battle climate change and clean up domestic energy production."