IRVING, Texas (AP) – Environmental activists blocked the entrance to Exxon Mobil’s headquarters Tuesday and climbed onto the roof to protest what they said was the oil company’s inaction against global warming.

The environmental group Greenpeace said 32 protesters were arrested. Police did not immediately confirm how many were taken into custody.

The protesters used an extension ladder to reach the roof. More protesters dressed in tiger costumes – Exxon has long used a tiger as its advertising symbol – were caught at the bottom of the ladder.

The protest was timed to coincide with preparation for the oil company’s shareholder meeting in Dallas on Wednesday.

Exxon Mobil, the world’s largest publicly traded oil company, had lobbied to block the Kyoto treaty and other efforts to impose limits on greenhouse emissions that many scientists link to global warming, Greenpeace spokesman Ben Stewart said.

Company spokesman Tom Cirigliano said Greenpeace was unfairly targeting Exxon Mobil.

“There is no company in the industry putting more time, effort or money into new technologies that will provide real answers to greenhouse emissions,” Cirigliano said.

At Wednesday’s meeting, investors will vote on a dozen shareholder resolutions, including one demanding that the company study its vulnerability to potential requirements to limit greenhouse gas emissions.

Chairman and chief executive Lee R. Raymond has opposed immediate limits on greenhouse emissions, calling instead for more scientific study, voluntary emission reductions and long-range technological improvements.