We only have data for our small portion of visiting this planet and having technology to measure. Cyclical can mean there are changes that occur over hundreds or thousands of years, and also may be affected by the Sun and other planetary influences as we rotate through space.
Does pollution cause problems - probably yes, and while we have started to control it over years - other countries are doing more (China) pollution that we have no control over. It's like recycling - a nice thing to do for the environment, and being a good neighbor. Does that mean we really affect the environment in that grand a manner? Scientist on all sides are attempting to explain:
Here's an interesting view on influences on the temperate climate changes.
Solar Cycles Cause Global Warming & Cooling
By Nick Anthony Fiorenza
ICECAP, June 3, 2011
Planetary warming has also been observed on Mars, Jupiter, Pluto, and on Neptune’s largest moon Triton during the decades following the peak of the “Solar Grand Maximum” – wonder why – there are no humans there! And Pluto is moving further from the sun in its orbit, thus it should be cooling, but instead it is warming. This is but one blatant indicator that suggests that the climate change on Earth is due to solar changes and our intersellar environment rather than mere human antics.
More importantly, the Sun is now changing from its Solar Grand Maximum to its Solar Grand Minimum. The Earth heats up after a Solar Grand Maximum, lagging a bit after the peak. With a Solar Grand Minimum now on its way, a “global cooling” may be on the horizon–a natural oscillation occurring in much longer solar cycles.
Latest science reveals that sharp increases in global warming “precede” sharp increases in CO2–not the other way around. Global warming causes more CO2 to be released form the oceans. Current research also shows that Earth’s oceans are now beginning to cool. It is also now clear that temperatures over the last century correlate far better with cycles in oceans than they do with carbon dioxide; and, the temperature cycles in oceans are caused by cycles of the sun.
Let the AGW (Anthropogenic Global Warming) advocates, as well as the media, continue to ignore all of this, perpetuating fear and advocating spending billions of dollars on non-solutions. Although humans contribute to greenhouse gases, the overall effect is a tiny fraction compared to natural causes. To say humans are the cause of global warming; and to also make predictions that global warming will continue to increase is simply inaccurate. This is not to ignore the silver lining of the global warming scare, as humanity must certainly learn to participate in harmony with nature, with the breath of the Earth and with her land and oceans; and with the cycles of the Sun, Moon, planets, and stars.http://anhonestclimatedebate.wordpress.com/2011/06/05/solar-cycles-cause-global-warming-cooling/