Christiana Figueres, executive secretary of the U.N. Framework Convention on Climate Change, said countries were ahead of schedule in negotiating a landmark agreement on curbing greenhouse gases that can be adopted at a Paris summit in December.
"We're in a very, very different position to Copenhagen not just from a procedural point of view, but from many other points of view," Figueres told reporters during a visit to Australia.
The price of solar panels has plummeted 80 per cent since Copenhagen. Panels are also 40 per cent more efficient, thanks to technologies that include Tesla batteries that can store solar electricity in homes.
The cost of solar power was already the same or cheaper than power from the grid in at least 60 countries, she said. Investments in solar, wind and geothermal energy technologies have increased massively since Copenhagen, demonstrating "confidence that the investment into clean technologies is viable and is profitable," she said.
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The number of laws and regulations around renewable energy and climate change had increased 20-fold since Copenhagen, indicating that the world's regulatory framework was headed toward a cleaner energy mix, she said.
UN negotiators in February produced an early draft of what eventually should become a landmark climate deal in Paris. The draft was produced four months ahead of schedule. The latest version has just 47 pages.
"That is remarkably different to where we were in the lead up to Copenhagen where we did not have an official negotiating text, where we had 300 pages of compilation of texts, but certainly no negotiating text," Figueres said.