The cycle of phases has an average period of 29.53... days (rounded).
If the moon is full tonight, then it will be full again in 59.06 days.
59.06 days is 8 weeks and 3.06 days.
Does that fit what you mean by "about" 8 weeks ?
Answer: Bassically, certain gasses like CO2 (Carbon Dioxide) that come from stuff like burning fossil fuels and global warming, they heat up the earth, are wastes and are used as fuel.
A ) the creation of the north American free trade agreement in 1994.