"This is the first time in history that a solar-powered car has traveled all the way around the world without using a single drop of petrol," said Louis Palmer, the 36-year-old Swiss schoolteacher and adventurer who made the trip.
"These new technologies are ready," he said. "It's ecological, it's economical, it is absolutely reliable. We can stop global warning."
Palmer's appearance at the conference marked the end of a 32,000-mile (52,000-kilometer) journey that began 17 months ago in Lucerne, Switzerland and took him through 38 countries.
The car, which runs noiselessly, can travel up to 55 mph (90 kph) and covers 185 miles (300 kilometers) on a fully charged battery.
Palmer said he lost only two days to breakdowns during the journey.
"This car runs like a Swiss clock," he said.
He calls his vehicle, which was developed by scientists at Swiss universities, a "solar taxi" because he has given rides to about 1,000 people
-- officials and regular folk alike -- to convince them of the technology's viability.
Passengers have included New York City Mayor Michael Bloomberg and U.N. Secretary-General Ban Ki-moon.
Delegates in Poznan are seeking an ambitious new climate treaty that would replace the Kyoto Protocol, which expires in 2012 and has required that 37 countries slash emissions of heat-trapping gases by an average 5 percent from 1990 levels.
The goal is for the new treaty to be finalized at the next U.N. climate meeting in December 2009 in Copenhagen, Denmark.
"Here at the conference, we are talking about reducing emissions by 10 or 20 percent," Palmer said. "I want to show that we can reduce emissions by 100 percent
-- and that's what we need for the future."
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