Yes it is really happening and really is caused by humans. The so called "debates" about whether it is caused by humans are on primarily on political blogs, not among scientists. Here is some of the evidence for it.
Starting with summaries from
NOAA- The National Oceanic and Atmospheric Administration of the US Department of Commerce
http://www.ncdc.noaa.gov/indicators/
and NASA The National Aeronautics and Space Administration
http://climate.nasa.gov/
And the National Academy of Sciences.
http://www8.nationalacademies.org/onpinews/newsitem.aspx?RecordID=05192010
Then moving on to other specifics.
Reduced Arctic Sea Ice extent:
http://nsidc.org/data/seaice_index/images/daily_images/N_stddev_timeseries.png
Reduced Arctic Sea Ice Volume:
http://psc.apl.washington.edu/ArcticSeaiceVolume/images/BPIOMASIceVolumeAnomalyCurrent.png
Reduced ice mass in the Antarctic:
http://www.nature.com/ngeo/journal/v2/n12/full/ngeo694.html
Global reductions in Glaciers:
http://www.grid.unep.ch/glaciers/
Local reductions in Glaciers
http://www.nrmsc.usgs.gov/repeatphoto/download_info.htm
Don't be misled by people who claim that the current global warming is a natural cycle. They can't identify a natural cycle that is rapid enough to account for the current warming trend.
Don’t be misled by people who claim the sun is getting warmer. There is no data to support that claim.
Don't be misled by people who claim that humans can't be the cause because it has been warm before. Being warm before doesn't prove that humans aren't causing the current changes.
Don't be misled by people who claim that the world can't be warming because it is cold this winter where they are. That argument proves nothing about global averages.
Don't be misled by people who claim that global warming is all just based on models. Look at the data and you will see that they are wrong.
Don't be misled by people who cite nothing for a source, or nothing but political blogs and tabloid newspapers.
Instead you may wish to consider the opinion of the Royal Society (British)
http://royalsociety.org/climate-change-summary-of-science/
And the opinion of the editors of Science Magazine
http://www.sciencemag.org/content/326/5960/1646.full