If you feel proud about having planted a tree sometime to help protect the environment, you may have to think again.

Pakistan has apparently set a record for tree plantings, with volunteers planting about 1,800 mangroves each in a day in mud and temperatures of up to 37 Celsius, according to the WWF International conservation group. 

Maybe such competitions will catch on if a new U.N. climate treaty due to be agreed in Copenhagen in December includes measures to combat deforestation. Trees soak up greenhouse gases as they grow and release them when they burn or rot.

According to a WWF statement, 300 volunteers planted 541,176 young mangroves without any mechanical equipment in the Indus River Delta, about 150 km south east of Karachi. That beat the previous Guinness World Record of 447,874 trees in a day held by India, it says.

“We hope that tree planting competitions will become as popular as cricket matches,” Richard Garstang, head of WWF Pakistan Wetlands Programme, said in the statement. Mangroves provide homes for creatures such as shrimps and lobsters and help protect coasts from tsunamis.