The human factor is the main  factor for climate change.

Change is dynamic!

Climate change is natural where natural forces play role.

However, human beings are also contributory. Greedy development desires of human being and race to lead ahead is very important and serious factor that contributes major part in climate change.

Situation is complicated. Our Earth system is composed of four sub-systems interacting at boundaries or at higher levels. However, any activity carried out by humans (who are by now become geological force) in the present times, sometimes called Anthropocene, is bound to have effects on the four sub-systems including biosphere, human species is part of which.  Past climate changes as geological research suggests have resulted due to high CO level as in Phanerozoic climate, due to solar forcing or due to Earth precession or axial precession just as a spinning top does with varying claims of its cycle from 26,000 to 100,000 years of alternating cold and warm period or glacial and inter-glacial period. There is no evidence of carbon dioxide or other gases from natural process as fast movement of plates which results in the release of CO2 and other greenhouse gases from oceans, large scale volcanic eruptions etc. Hence, understanding gains till the date points out that present global warming is anthropogenic.

However, the greatest barrier to public recognition of anthropogenic climate change is the natural variability of climate. How can a person discern long-term climate change, given the notorious variability of local weather and climate from day to day and year to year?

The human factor is the main  factor for climate change.

In my opinion at present the dominant factor is a human activity

I wish you all the happiness!

In order to talk about climate change, one need to understand the mechanisms of climate and its hierarchy.

If you look in the past, we find that between 100-5 thousand years past climate, sea level, magnetic field, tectonic movements changed quite significantly from ice ages to suptropichnyh current conditions in temperate latitudes. These processes were happening and are happening in their own  natural way, and man doesnt have almost anot effect on them whatsoever.

A person can affect the ecology and maybe a climate on small level as in cities, but not climate on a global level. It is my opinion.

Regards, Dolia Vadym.

Natural resources exploited for energy by human greed has impact on climate change

http://www.teriin.org/events/CoP16/India_Energy_Security.pdf

Crystal clear the Homo sapiens (who are not "sapiens" at all, but ignorant) are creating the conditions for climate change. Difficult to explain to people as the subject of "weather" is not taught at schools (it should have been the NO 1 subject these days!).

The science of the weather is so simple, that even monkeys can understand, yet, there are no simplified versions for children. However, I have been using my own through my courses for teachers-to -be.

In Canada, I am ashamed to say, that no globes are to be found at schools anymore. In the USA, globes are hard to find in stores. I had to bring from Canada to give my grandchildren!!. NO wonder "weather" is so mystified and a mysterious affair.

In the past a visionary man treated the wolf as brother wolf. Now man behaves like a mad wolf, destroying nature.

There are many influences over the Earth’s climate, which can be distinguished into ‘natural’ and ‘anthropogenic’ (human-induced) factors. Since the beginning of the 20th century, scientists have been observing a change in the climate that can not be attributed to any of the ‘natural’ influences of the past only. This change in the climate, also known as global warming, has occurred faster than any other climate change recorded by humans and so is of great interest and importance to the human population.

https://www.wmo.int/pages/themes/climate/causes_of_climate_change.php

Both has weight in the domain of climate change but human beings factor is leading in bad changes mostly.

I agree with Fateh and George. It is in our hands to stop climate change. We all know that, as well as we know the interests of some governments...

Both man-made doings & natural forces carry weight in impacting climate change.  However, from historical records, higher frequency of man-made doings are accelerating the climate change.  Following depict the impact of climate change including global warming which have traces of human own doings that eventually impact our human race (see link below for details): rising sea levels, shrinking glaciers, heat waves, more storms & floods, drought, more diseases, financial setbacks, wars & conflicts, lost of biodiversity, damage of ecosystem.

http://www.disasterium.com/10-critical-facts-about-global-warming/

To know what are the man-made disasters - that the impacts can beyond climate change (whereby they still can threaten our human lives), you can refer to this link:

http://www.disasterium.com/10-worst-man-made-disasters-of-all-time/

To know some of the 10 worst natural disasters, you can refer to this link:

http://www.disasterium.com/10-worst-natural-disasters-of-all-time/

Reflecting on this question - we need to do more by controlling our self-interest, promoting environmentally friendly initiatives & evaluating how these negative climate change / man-made disasters really impact our future generations (we might not old enough to see the impact, but I think we don't want them to suffer due to our own doings).

Yes,  Han Ping Fung,

Both are responsible! But human interference is increasing.

It is likely that human activities are "by far the dominant cause of warming" in Earth's climate since 1950, according to a study published in the journal Nature Geoscience. The amount of warming contributed by natural forces — for example, changes in solar radiation — during that time was, say the study's authors, "near zero."

Most predictions of temperature increase as a result of greenhouse gas emissions employ a technique called optimal fingerprinting, which involves statistical analysis of complex climate models.

For more information, please consult

http://news.discovery.com/earth/global-warming/humans-are-dominant-cause-of-warming-111206.htm

I find it an absolute disgrace that no-one mentions THE authorative reports by the United Nations and the World Meteorological Organization. First read the available science. Why do we see all these one-sentence amateur entries here in the item of Climate Change? ResearchGate is a sceince forum

http://www.ipcc.ch/report/ar5/wg1/

I have writen and documented and detailed described that, and discovered the mechanisms involved

https://www.researchgate.net/profile/Dimis_Poulos