Humans and their activities are the culprits who lead to increase in carbon dioxide levels in earth's atmosphere. This is what France says and believes said the government.
In a 21-page report that was published showed that global climate has changed because of various factors from 1975-2003. This has led to rise in average global temperature and humans are to be targeted for that.
CO2 rise is behind this mayhem. The report said, "Solar activity, which has slightly decreased on average since 1975, cannot be dominant in the observed warming during this period".