Simplify the following text for a Grade 12 native English-speaking person.
Original: On 1 February 2007 , the eve of the publication of IPCC 's major report on climate , a study was published suggesting that temperatures and sea levels have been rising at or above the maximum rates proposed during the last IPCC report in 2001 .
Simplified: On February 1 , 2007 , the night before publication of IPCCs report on climate , a study was published saying that temperatures and sea levels have been rising at or above the speed the IPCC reported in 2001 .