OSLO: Three decades after former US President Jimmy Carter experimented with solar panels on the White House roof, grim UN warnings about climate change may kick-start wider global use of renewable energy.

“The political willingness to act is now significantly higher,” Achim Steiner, head of the UN Environment Programme (UNEP), told Reuters.

Governments from Japan to Germany are already subsidising energies such as wind, hydro, biofuels, geothermal, solar or tidal power, spurred by worries about security of supply, climate change and high oil prices at about $60 a barrel.

Steiner said warnings by the world’s top climate scientists in a Feb 2 report that blamed mankind more clearly than ever for causing global warming – mainly by emitting greenhouse gases from burning fossil fuels – would be a big new spur.

“This will change the variables, renewable energies will become a more significant part of our energy mix,” he said.

Past waves of optimism for renewables, such as during an energy crisis in the 1970s under Carter, foundered on technological barriers and a lack of competitiveness when oil prices fell below $10 in the mid-1980s.

Many experts also warn against exaggerated hopes this time, despite increasing public pressure to act.

“There will be a push for renewable energies, but they have limitations,” said Fatih Birol, chief economist of the International Energy Agency (IEA), which advises governments in developed nations. Windmills cannot generate electricity on still days, for instance, and solar power doesn’t work at night.

“They can be part of the solution but they are not the magic bullet,” Birol said. He said energy efficiency was the main way both to curb climate change and to cut energy imports, and renewables and nuclear power are secondary solutions.

According to the IEA, renewable energies met 13.2 per cent of world primary energy demand in 2004 and their share is likely to edge up to 13.7 per cent by 2030, on present trends. Fossil fuels will remain dominant at about 80 per cent.

Most of the total renewable energy used is biomass, firewood burnt by 2.5 billion people in the Third World. Even in an alternative scenario with stronger incentives for renewables, their share would reach just 16 per cent by 2030, the IEA says.

“Anybody who claims that they can make an energy revolution overnight I think is not being realistic. Coal, given the deposits around the world, is going to be part of the energy mix,” Steiner said.

Still, he noted that clean energies dominated by hydropower generated 18 per cent of world electricity in 2004 – ahead of 16 per cent for nuclear. “Renewable energies are already quite an important part of our supply system,” he said.

Carter, a Democrat, put solar panels on the White House roof in the late 1970s amid worries that oil supplies were running out and could be shut off by more Arab oil embargoes.

He said that the energy crisis was, “apart from war, the greatest challenge our country will face during our lifetimes.”

In a sign of changed attitudes, firms such as US retailer Wal-Mart now win wide praise for installing solar panels on superstores. And renewable energy firms are booming.

“Everything happening around climate issues is affecting the solar industry positively,” said Erik Thorsen, chief executive of Norway’s Renewable Energy Corp., one of the world’s biggest makers of solar energy equipment.

REC’s share price has roughly doubled since a 2006 listing, giving the firm a market capitalisation of $12 billion. Trading at around 39 times its forecast 2007 earnings, the firm has a higher valuation than Internet giant Google. A minority of analysts worry the boom is a bubble.

Thorsen says solar power could be the prime source of energy by 2100 – consigning fossil fuels to an interlude in human history since the Industrial Revolution in the 18th century – even though prices are far from competitive with fossil fuels.

Birol at the IEA said the world had a chance in the next decade to shift course – many power plants built in western nations after World War Two are up for renewal, and China is opening coal-fired power plants at a rate of almost one a week.

The UN Climate Panel, the bedrock for government environmental policy-making, said in its Feb 2 study that it was “very likely”, or at least 90 per cent certain, that human activities were the main cause of global warming, up from “likely” or a 66 per cent probability, in a 2001 report.

It projected wrenching changes from rising temperatures including higher seas, more droughts, more powerful storms and floods.

Industry groups say the IEA projections for renewables are too pessimistic and environmentalists want to phase out nuclear power.

50 PER CENT BY 2050?

EREC and Greenpeace issued a report this year saying that 50 per cent of all world energy could come from renewables by 2050.

But this hinged on shifts in government policy, forecasts of rising oil prices and penalties for emitting greenhouse gases.

Renewable energies have all been around for a long time.

“In many cases the technology is there, but hasn’t reached the market,” said ex-Swedish Prime Minister Goran Persson, who introduced tax breaks during his 1996-2006 term to foster everything from biofuels to cuts in heating with oil.

“The market is not enough to solve this. We also need political decisions,” he said.

Even environmentalists have objections to some renewable energies, such as damage by windmills. Ten white-tailed eagles have been killed in

just over a year by wind turbines on the remote islands of Smoela off Norway.

“The frequency is as high as from turbines in the Altamont Pass in California, which is often seen as a bad example of bird deaths,” said Arne Follestad of the Norwegian Institute for Nature Research.

He said birds seemed less vulnerable in heavily populated areas where turbines were often sited on harbours, in fields or near roads. “If you go to a pristine area you meet species that live there to avoid human activity,” he said.—Reuters