For those who think climate change is not occurring, the planets foremost group that has been studying it, says global warming is "unequivacably happening".
The group is called the Intergovernmental Panel on Climate Change (IPCC):
Who are the IPCC?
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"The Intergovernmental Panel of Climate Change is the leading body for the assessment of climate change, established by the United Nations Environment Programme (UNEP) and the World Meteorological Organization (WMO) to provide the world with a clear scientific view on the current state of climate change and its potential environmental and socio-economic consequences.
The IPCC is a scientific body. It reviews and assesses the most recent scientific, technical and socio-economic information produced worldwide relevant to the understanding of climate change. It does not conduct any research nor does it monitor climate related data or parameters. Thousands of scientists from all over the world contribute to the work of the IPCC on a voluntary basis. Review is an essential part of the IPCC process, to ensure an objective and complete assessment of current information. Differing viewpoints existing within the scientific community are reflected in the IPCC reports.
The IPCC is an intergovernmental body, and it is open to all member countries of UN and WMO. Governments are involved in the IPCC work as they can participate in the review process and in the IPCC plenary sessions, where main decisions about the IPCC workprogramme are taken and reports are accepted, adopted and approved. The IPCC Bureau and Chairperson are also elected in the plenary sessions.
Because of its scientific and intergovernmental nature, the IPCC embodies a unique opportunity to provide rigorous and balanced scientific information to decision makers. By endorsing the IPCC reports, governments acknowledge the authority of their scientific content. The work of the organization is therefore policy-relevant and yet policy-neutral, never policy-prescriptive."
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Their last comprehensive study on global climate change was released in 2007, and it is called the Fourth Assessment Report (AR4), they are currently preparing to release the Fifth Assessment Report (AR5) this year. The AR5 says that global warming is even worse now.
You can read the findings of their AR4 report from 2007 here in their Synthesis Report:
http://www.ipcc.ch/pdf/assessment-re...yr/ar4_syr.pdf
A sample of thier conclusions called Robust Findings:
"Warming of the climate system is unequivocal, as is now evident
from observations of increases in global average air and ocean
temperatures, widespread melting of snow and ice and rising global
average sea level. {WGI 3.9, SPM}
Many natural systems, on all continents and in some oceans,
are being affected by regional climate changes. Observed changes
in many physical and biological systems are consistent with warming.
As a result of the uptake of anthropogenic CO2 since 1750, the
acidity of the surface ocean has increased. {WGI 5.4, WGII 1.3}
Global total annual anthropogenic GHG emissions, weighted
by their 100-year GWPs, have grown by 70% between 1970 and
2004. As a result of anthropogenic emissions, atmospheric concentrations
of N2O now far exceed pre-industrial values spanning many
thousands of years, and those of CH4 and CO2 now far exceed the
natural range over the last 650,000 years. {WGI SPM; WGIII 1.3}
Most of the global average warming over the past 50 years is
very likely due to anthropogenic GHG increases and it is likely that
there is a discernible human-induced warming averaged over each
continent (except Antarctica). {WGI 9.4, SPM}
Anthropogenic warming over the last three decades has likely
had a discernible influence at the global scale on observed changes
in many physical and biological systems. {WGII 1.4, SPM}"
