random6 wrote:
Global land temperatures have plummeted by one degree Celsius since the middle of this year – the biggest and steepest fall on record.
http://www.breitbart.com/london/2016/11/30/global-temperatures-plunge-icy-silence-climate-alarmists/
OP, here's your answer, sort of. It really depends on the time frame.
1 year: Direction is down. Steepest decline in recorded history. Over 1 degree C. in the past 9 months. Cause: End of El Nino spike in temperature in 2015.
18 year: Direction is sideways. Continued pause, possibly 18 years into a 30 year cycle of decline/pause. Similar 30 year pause/declines can be seen as far back as recorded temperature readings.... 1880-1910, 1940 to 1970, and 1998 to present date. Cause: Unknown. Likely a natural cycle.
Several hundred years: Direction is up. After the Roman Warming period about 800AD to 1200AD, the world went into a cooling period known as the Little Ice Age which lasted until the late 1600s. The trend began to move up in 1700 and accelerated in the 1800s (long before CO2 levels began to increase dramatically after WWII). This cycle appears to be roughly 400-500 years long.
So, what you're seeing is a long term 400+ year upwards trend overlapping a 30 year cycle that is currently in the down phase with periodic bursts up and down due to El Nino.
On top of all this, there MIGHT be a minimal warming effect due to CO2, but it's not the driving force, as Al Gore and the IPCC would have you believe. If warmer temps were due to CO2, then the 1940-1970 decline would never have existed.
THE WHOLE CLIMATEGATE fiasco was to "hide the decline", referring to the 1940 -1970 decline because it blows up the whole global warming hypothesis.