More evidence than you can shake a hockey stick at
Last week, the NOAA published a must-read report outlining 10 climate indicators of global warming. A few days later, Dr James Powell published a must-watch YouTube video outlining many more lines of evidence for a warming world:
The video opens by listing the many groups that endorse the consensus that humans are causing global warming:
33 national science academies
68 national and international science organisations believe
97% of climate scientists
However, Dr Powell recommends you look at data and decide for yourself. At this point, he presents a whole bevy of climate indicators. Being a big fan of graphs, I'm going to have to delve into all his sources and publish some of these on Skeptical Science. Here's a taste of some of the evidence he presents:
The rise in temperature, along side CO2 concentrations and human CO2 emissions (a veritable cluster of hockey sticks)
Many different proxy records showing the unusual warming over the past century compared to previous centuries
The increase in the number of record high temperatures compared to record lows, both in the USA and Australia (but why hasn't this analysis been done in other countries?)
The growing season is lengthening
Nights have warmed more than days, ruling out the sun as the cause of recent global warming
The oceans have warmed steadily according to a number of independent ocean heat reconstructions
More wildfires
Snows are melting earlier in the year, sometimes as much as 20 days earlier in the spring
Fire seasons are starting earlier, last longer and are harder to control
The Northern Hemisphere is losing snow cover and permafrost
The world's glaciers are losing ice each year
Arctic sea ice extent and volume have both declined
Greenland is losing ice and the ice loss is steadily spreading north
Antarctica is losing ice
Sea levels are rising
Ocean acidity is increasing across the world's oceans
Northern Hemisphere plant species are moving up slopes
U.S. bird species are migrating further north to cooler temperatures
Biological events like timing of breeding, emerging of flowers and butterfly emergence are happening earlier in the year
Regions where climate is more favourable to plants are steadily migrating north
