Scientists opinion

American Institute of Professional Geologists

In 2009, the American Institute of Professional Geologists^{[108][dead link]} (AIPG) sent a statement to President Barack Obama and other US government officials:
The geological professionals in AIPG recognize that climate change is occurring and has the potential to yield catastrophic impacts if humanity is not prepared to address those impacts. It is also recognized that climate change will occur regardless of the cause. The sooner a defensible scientific understanding can be developed, the better equipped humanity will be to develop economically viable and technically effective methods to support the needs of society.^{[109][dead link]}
Concerned that the original statement issued in March 2009 was too ambiguous, AIPG's National Executive Committee approved a revised position statement issued in January 2010:
The geological professionals in AIPG recognize that climate change is occurring regardless of cause. AIPG supports continued research into all forces driving climate change.^{[110][dead link]}
In March 2010, AIPG's Executive Director issued a statement regarding polarization of opinions on climate change within the membership and announced that the AIPG Executive had made a decision to cease publication of articles and opinion pieces concerning climate change in AIPG's news journal, The Professional Geologist.^[111] The Executive Director said that "the question of anthropogenicity of climate change is contentious."^[112]

Canadian Federation of Earth Sciences

The science of global climate change is still evolving and our understanding of this vital Earth system is not as developed as is the case for other Earth systems such as plate tectonics. What is known with certainty is that regardless of the causes, our global climate will continue to change for the foreseeable future... The level of CO₂ in our atmosphere is now greater than at any time in the past 500,000 years; there will be consequences for our global climate and natural systems as a result.^[113]