"The commercialization of shale gas and oil in the 21st century has dramatically increased global methane emissions", said the scientist behind the study.
Fasting can lead to reduced iron levels and dehydration, warns American Society of Nutrition members.
Other students in the class expressed support for the teacher and the student's protest.
Maximilien R. Reynolds reportedly possessed an unassembled AR-15-style rifle, combat equipment and 300 rounds of ammunition.
The Canadian student at Cornell University faced possible deportation if convicted of a hate crime.
Astronomers at Cornell University made the calculation.