I agree that there is a climate change occurring in our world today and that it does arise from us humans and our actions. According to the EPA the temperature on earth has risen 1.4 degrees Fahrenheit in the last century and in the next century will most likely increase between 2-11.5 °F. This may seem like very small changes, but they all add up in the long term to gravely affect our “climate and weather.” Some of the evidence that supports the idea of global warming is the changes in climate in many regions of the world. In some places rainfalls have increased, droughts have begun to occur, and major heat waves have been produced. Other evidence is present in the water. Sea levels are rising as the polar ice caps are melting.
So, what is it that is causing these drastic changes? Most likely, we are. As our industries grow and as we become more dependent on energy to be able to live, we are releasing more CO₂ and greenhouse gases into the atmosphere. Most of our energy comes from burning fossil fuels and produces these gases. The EPA said in their article: Climate Cha nge: Basic Information that “Greenhouse gases act like a blanket around Earth, trapping energy in the atmosphere and causing it to warm.”
Now that we know that these changes are occurring, we can take action to fix it. By reducing our carbon footprint we are helping the environment and the future of our planet. We can always start simple by unplugging electronics when not in use, turning the faucet off while we brush our teeth, or even by changing our light bulbs to some that save more energy.
Sources: http://www.epa.gov/climatechange/basics/

I agree on how human activities increase climate changes but climate change is going to happen even if every single factory closes and every single car stops running.  Reducing the Our carbon footprint does help the environment by not increases the effects of climate change. Since this is not the only time the Earth has warmed up, back around the Cenozoic time period the PETM occurred and it was a time where the Earth got hotter than today's warming.

If we continue to burn fossil fuel at an increasing rate it will eventually become much hotter than the PETM. Who know what would happening in such temperatures. What would happen to the economies when Fossil fuel runs out. It will all be a big,fat mess if we don't reduce and replace Fossil fuel.

I agree with you, but nature may also play a role in global warming as the Earth did warm up and cool down in the past without humans. 
In an article titles “A Basin Filled with Time” an archaeologist looks for mammals and plants in a basin to prove that PETM (a time when the Earth got very warm) was true. He found mammals and plants (plants where very important because it mammals could adapt to the temperature but plants had a tougher time) to prove that the Earth did indeed get killer. This was due to lots of carbon dioxide being sent into the air by volcanoes or another source.
So, even today, nature may play a role in global warming. But, I have to agree with you, us humans are playing a huge impact in the earth getting warmer with our CO2 emissions through things such as gas cars, and factories.

I agree with you Namna, yes climate change is always going to happen no matter what. It is a natural Process Earth goes through. Even if we completely stop emitting carbon dioxide into the atmosphere, which is very unrealistic, but if it did the Planet would still naturally go through climate change. Right now we are only making it worse but we can still do something to help reduce the speed of climate change. Humans helping to drastically reduce climate change doesn't seem to be going to happen so easily because our industries are just going to keep on growing.

I definitely agree that climate change is occurring and I think that our human interaction is heavily influencing our plants climate change. Especially with our use of fossil fuels and Co2 that we emit into the air.  We should cut down on the amount of Co2 that is released into the atmosphere, Because it is also a high contributor to climate change, Also about 82% of greenhouse gases that are released into the atmosphere in the U.S during 2012 were from our human activities. However I also think it's natural for Earth to go through heating and cooling periods at time but maybe not to this degree.