Mr. Speaker, when we read everything that is written on this subject, the 17 academies, the thousands of scientists who have spoken to this issue and every day we pick up the paper there is another group saying that the evidence is irrefutable, that this damage is caused by human activity. To argue otherwise, I submit, is just burying one's head in the sand.
Certainly, I agree with the hon. member that there will be some scientists who will say that the evidence is not conclusive, that human activity is causing this problem but there will always be scientists who disagree with that. I do not know if it is going on presently, but do not forget that within the past five years scientists by the dozens and dozens were testifying in court in the United States of America saying that cigarette smoke had no relation to the health of individuals. We know that is simply not true.
To answer the hon. member's question, the evidence is overwhelming that human activity is causing an increase in greenhouse gas emissions.