Simplify the following text for a Grade 16 native English-speaking person.
Original: The InterAcademy Panel Statement on Population Growth , which was ratified by 58 member national academies in 1994 , called the growth in human numbers `` unprecedented '' , and stated that many environmental problems , such as rising levels of atmospheric carbon dioxide , global warming , and pollution , were aggravated by the population expansion .
Simplified: The InterAcademy Panel Statement on Population Growth called the growth in human numbers `` unprecedented '' , and stated that many environmental problems , such as rising levels of atmospheric carbon dioxide , global warming , and pollution , were made worse by the population expansion .