The UN climate reports

You can fetch the United Nations Summary for Policymakers of Working Group I (The physical basis of climate change) of the IPCC, Paris, February 2007 here: UN-climate-report-I, or from the IPCChttp://www.ipcc.ch/SPM2feb07.pdf directly.

GreenhouseGases

You can fetch the United Nations Summary for Policymakers of Working Group II (Climate Change Impacts, Adaptions and Vulnerability) of the IPCC, Brussels, April 2007 here: UN-climate-report-II, or from the IPCChttp://www.ipcc.ch/SPM6avr07.pdf directly.

You can fetch the United Nations Summary for Policymakers of Working Group III (Mitigation of Climate Change) of the IPCC, Bangkok, May 2007 here: UN-climate-report-III, or from the IPCChttp://www.ipcc.ch/SPM040507.pdf directly.

You can fetch the United Nations Summary for Policymakers of the Fourth Assessment Report of the IPCC, Valencia, November 2007 here: UN-climate-synthesis-report, or from the IPCChttp://www.ipcc.ch/pdf/assessment-report/ar4/syr/ar4_syr_spm.pdf directly. It is a summary and synthesis report of the three IPCC Working Group reports.

Excerpts from the report I (working group I)

In my opinion it is the graph of Changes in the greenhouse gases... which proofes that there is a relationship between the emission of greenhouse gases and the global warming of the earth. There can be NO discussion about that anymore. The graph shows the ppm of the relevant greenhouse gases in the atmosphere and their contribution to radiative forcing as a function of time (last 10.000 years). The different colours belong to different studies. It is striking and alarming to see an exponential increment within the last 100 years.

 

Other studies

There is an interesting climate study of the german physics society (DPG) from 2005 in german language, Klimastudie, mainly dealing
with energy related topics: DPG-Klimastudie. This study has been translated into englich: Climate Protection and Energy supply in Germany 1990 - 2020