Many people ask how sure we are about the science of climate change. The most definitive examination of the scientific evidence is to be found in the work of the Intergovernmental Panel on Climate Change (IPCC) and its last major report published in 2007. I had the privilege of being chairman or co-chairman of the Panel’s scientific assessments from 1988 to 2002.
Many hundreds of scientists from different countries were involved as contributors and reviewers for these reports, which are probably the most comprehensive and thorough international assessments on any scientific subject ever carried out. In June 1995, just before the G8 summit in Scotland, the Academies of Science of the world’s 11 largest economies (the G8 plus India, China and Brazil) issued a statement endorsing the IPCC’s conclusions and urging world governments to take urgent action to address climate change. The world’s top scientists could not have spoken more strongly.
Unfortunately, strong vested interests have spent millions of dollars on spreading misinformation about climate change. First, they tried to deny the existence of any scientific evidence for global warming. More recently, they have largely accepted the fact of man-made climate change but argue that its impacts will not be great, that we can “wait and see” and that in any case we can always fix the problem if it turns out to be substantial.
The scientific evidence does not support such arguments. Urgent action is needed both to adapt to the climate change that is inevitable and to reduce emissions of greenhouse gases, especially carbon dioxide, to prevent further damage as far as possible.
At the Earth Summit in Rio de Janeiro in 1992, the world’s nations signed up to the Framework Convention on Climate Change, the objective of which is “to stabilize the concentration of greenhouse gases in the atmosphere at a level that does not cause dangerous interference with the climate system ... , that allows ecosystems to adapt naturally to climate change, that ensures food production is not threatened, and that enables economic development to proceed in a sustainable manner.”
Such stabilization would also eventually stop further climate change.
It is now recognized that widespread damage due, for instance, to sea level rise and more frequent and intense heat waves, floods and droughts, will occur even after small increases of global average temperature. Therefore, it is necessary that very strong efforts be made to hold the average global temperature rise below 2˚C relative to its pre-industrial level.
If we are to have a good chance of achieving that target, the concentration of carbon dioxide must not be allowed to exceed 450 parts per million (ppm), though it is now nearly 390ppm. This implies that before 2050 global emissions of carbon dioxide must be reduced to below 50 percent of the 1990 level (they are currently 15 percent above that level) and that average emissions in developed countries must be reduced by at least 80 percent of the 1990 level.
The UK has already committed itself to a binding target to reduce emissions by that amount and US President Barack Obama has expressed the intention that the US should also set that target.
One clear requirement is that tropical deforestation, which is responsible for 20 percent of greenhouse gas emissions, be halted within the next decade or two. Regarding emissions from the burning of fossil fuels, the International Energy Agency (IEA) in its “Energy Technology Perspectives” has set out in detail the technologies and actions that are needed in different countries and sectors to meet these targets.
For the short term, the IEA points out that very strong and determined action will be necessary to ensure that global carbon dioxide emissions stop rising (the current increase is more than 3 percent per year), reach a peak by about 2015, and then decline steadily toward the 2050 target. The IEA also points out that the targets can be achieved without unacceptable economic damage. In fact, the IEA lists many benefits that will be realized if its recommendations are followed.
What is required now is recognition that man-made climate change will severely affect our children, grandchildren, the world’s ecosystems and the world’s poorer communities, and that the severity of the impact can be substantially alleviated by taking action now.
John Theodore Houghton is a former professor of atmospheric physics at the University of Oxford and founder of the Hadley Centre for Climate Prediction and Research.
COPYRIGHT: PROJECT SYNDICATE
The EU’s biggest banks have spent years quietly creating a new way to pay that could finally allow customers to ditch their Visa Inc and Mastercard Inc cards — the latest sign that the region is looking to dislodge two of the most valuable financial firms on the planet. Wero, as the project is known, is now rolling out across much of western Europe. Backed by 16 major banks and payment processors including BNP Paribas SA, Deutsche Bank AG and Worldline SA, the platform would eventually allow a German customer to instantly settle up with, say, a hotel in France
On August 6, Ukraine crossed its northeastern border and invaded the Russian region of Kursk. After spending more than two years seeking to oust Russian forces from its own territory, Kiev turned the tables on Moscow. Vladimir Putin seemed thrown off guard. In a televised meeting about the incursion, Putin came across as patently not in control of events. The reasons for the Ukrainian offensive remain unclear. It could be an attempt to wear away at the morale of both Russia’s military and its populace, and to boost morale in Ukraine; to undermine popular and elite confidence in Putin’s rule; to
A traffic accident in Taichung — a city bus on Sept. 22 hit two Tunghai University students on a pedestrian crossing, killing one and injuring the other — has once again brought up the issue of Taiwan being a “living hell for pedestrians” and large vehicle safety to public attention. A deadly traffic accident in Taichung on Dec. 27, 2022, when a city bus hit a foreign national, his Taiwanese wife and their one-year-old son in a stroller on a pedestrian crossing, killing the wife and son, had shocked the public, leading to discussions and traffic law amendments. However, just after the
The international community was shocked when Israel was accused of launching an attack on Lebanon by rigging pagers to explode. Most media reports in Taiwan focused on whether the pagers were produced locally, arousing public concern. However, Taiwanese should also look at the matter from a security and national defense perspective. Lebanon has eschewed technology, partly because of concerns that countries would penetrate its telecommunications networks to steal confidential information or launch cyberattacks. It has largely abandoned smartphones and modern telecommunications systems, replacing them with older and relatively basic communications equipment. However, the incident shows that using older technology alone cannot
RSS