If not for human activity how long would carbon stay as fossil fuel

1,000 years

Explanation:

1,000 years

According to the U.N. Intergovernmental Panel on Climate Change (IPCC), which issued a special report on CCS in 2005, a properly selected site should securely store at least 99 percent of the sequestered CO2 for more than 1,000 years.

your answers are a,b,,e and f

i hope this

explanation: