The temperature of the earth have been much warmer many times for long periods. Based on this, climate deniers claim the current climate change is within “normal fluctuation”. Hold on. Time scale matters in climate change. They totally ignore the fact that the current rate of change observed in CO2, temperature and many other environmental variables is abnormal with dangerous strong correlation. The climate scientists are most alarmed with this rate of change. Earth can fix itself but the system can become very unstable and once it passes the tipping point the system become totally unpredictable. Most of the science simulation model indicates that human induced green house gases and many other activities are driving Earth environment into an unstable state. Look at this video, the climate deniers have no clues (R) or are sticking to the facts whose time scale is totally off. Dirty industries are clinging to the partial facts and intentionally ignoring bigger pictures.