||What the Science Says
||"It's the sun"
In the last 35 years of global warming, sun and climate have been going in opposite directions
||"There is no consensus"
97% of climate experts agree humans are causing global warming.
||"Models are unreliable"
||Models successfully reproduce temperatures since 1900 globally, by land, in the air and the ocean.
||"Animals and plants can adapt"
||Global warming will cause mass extinctions of species that cannot adapt on short time scales.
||"Antarctica is gaining ice"
||Satellites measure Antarctica losing land ice at an accelerating rate.
||"CO2 lags temperature"
||CO2 didn't initiate warming from past ice ages but it did amplify the warming.
||"We're heading into an ice age"
||Worry about global warming impacts in the next 100 years, not an ice age in over 10,000 years.
||"Hockey stick is broken"
||Recent studies agree that recent global temperatures are unprecedented in the last 1000 years.
||"Hurricanes aren't linked to global warming"
||There is increasing evidence that hurricanes are getting stronger due to global warming.
||"Glaciers are growing"
||Most glaciers are retreating, posing a serious problem for millions who rely on glaciers for water.
||"1934 - hottest year on record"
||1934 was one of the hottest years in the US, not globally.
||"Extreme weather isn't caused by global warming"
||Extreme weather events are being made more frequent and worse by global warming.
||"It's Urban Heat Island effect"
||Urban and rural regions show the same warming trend.
||"Mars is warming"
||Mars is not warming globally.
||"Increasing CO2 has little to no effect"
||The strong CO2 effect has been observed by many different measurements.
||"It's a 1500 year cycle"
||Ancient natural cycles are irrelevant for attributing recent global warming to humans.
||"IPCC is alarmist"
Numerous papers have documented how IPCC predictions are more likely to underestimate the climate response.
||"Polar bear numbers are increasing"
||Polar bears are in danger of extinction as well as many other species.
||"It's not happening"
There are many lines of evidence indicating global warming is unequivocal.
||"Greenland is gaining ice"
||Greenland on the whole is losing ice, as confirmed by satellite measurement.
||"CO2 is plant food"
The effects of enhanced CO2 on terrestrial plants are variable and complex and dependent on numerous factors
||"Arctic sea ice has recovered"
||Thick arctic sea ice is in rapid retreat.
||"There's no correlation between CO2 and temperature"
||There is long-term correlation between CO2 and global temperature; other effects are short-term.
||"It cooled mid-century"
||Mid-century cooling involved aerosols and is irrelevant for recent global warming.
||"CO2 was higher in the past"
When CO2 was higher in the past, the sun was cooler.
||"Satellites show no warming in thetroposphere"
||The most recent satellite data show that the earth as a whole is warming.
||"It's El Niño"
||El Nino has no trend and so is not responsible for the trend of global warming.
||"It's not us"
||Multiple sets of independent observations find a human fingerprint on climate change.
||"Mt. Kilimanjaro's ice loss is due to land use"
||Most glaciers are in rapid retreat worldwide, notwithstanding a few complicated cases.
||"It's Pacific Decadal Oscillation"
||The PDO shows no trend, and therefore the PDO is not responsible for the trend of global warming.
||"IPCC were wrong about Himalayan glaciers"
Glaciers are in rapid retreat worldwide, despite 1 error in 1 paragraph in a 1000 page IPCC report.
||"2nd law of thermodynamics contradicts greenhouse theory"
||The 2nd law of thermodynamics is consistent with the greenhouse effect which is directly observed.
||"The science isn't settled"
||That human CO2 is causing global warming is known with high certainty & confirmed by observations.
||"Sea level rise predictions are exaggerated"
||Sea level rise is now increasing faster than predicted due to unexpectedly rapid ice melting.
||"IPCC were wrong about Amazon rainforests"
The IPCC statement on Amazon rainforests was correct, and was incorrectly reported in some media.
||"Volcanoes emit more CO2 than humans"
||Humans emit 100 times more CO2 than volcanoes.
||"Greenland ice sheet won't collapse"
||When Greenland was 3 to 5 degrees C warmer than today, a large portion of the Ice Sheet melted.
||Methane plays a minor role in global warming but could get much worse if permafrost starts to melt.
||"CO2measurements are suspect"
||CO2 levels are measured by hundreds of stations across the globe, all reporting the same trend.
||"500 scientists refute the consensus"
||Around 97% of climate experts agree that humans are causing global warming.
||"Springs aren't advancing"
||Hundreds of flowers across the UK are flowering earlier now than any time in 250 years.
||"It's land use"
||Land use plays a minor role in climate change, although carbon sequestration may help to mitigate.
||"CO2 is not increasing"
||CO2 is increasing rapidly, and is reaching levels not seen on the earth for millions of years.
||"They changed the name from 'global warming' to 'climate change'"
'Global warming' and 'climate change' mean different things and have both been used for decades.
||"CO2 is coming from the ocean"
||The ocean is absorbing massive amounts of CO2, and is becoming more acidic as a result.
||"Pluto is warming"
||And the sun has been recently cooling.
||"Peer review process was corrupted"
||An Independent Review concluded that CRU's actions were normal and didn't threaten the integrity of peer review.
||"Renewable energy is too expensive"
When you account for all of the costs associated with burning coal and other fossil fuels, like air pollution and health effects, in reality they are significantly more expensive than most renewable energy sources.
||"Sea level rise is decelerating"
Global sea level data shows that sea level rise has been increasing since 1880 while future sea level rise predictions are based on physics, not statistics.
||"It's microsite influences"
||Microsite influences on temperature changes are minimal; good and bad sites show the same trend.
||"Phil Jones says no global warming since 1995"
||Phil Jones was misquoted.
||"Dropped stations introduce warming bias"
||If the dropped stations had been kept, the temperature would actually be slightly higher.
||"It's not urgent"
A large amount of warming is delayed, and if we don’t act now we could pass tipping points.
||"Tree-rings diverge from temperature after 1960"
||This is a detail that is complex, local, and irrelevant to the observed global warming trend.
||"Roy Spencer finds negative feedback"
||Spencer's model is too simple, excluding important factors like ocean dynamics and treats cloud feedbacks as forcings.
||"It's global brightening"
||This is a complex aerosol effect with unclear temperature significance.
||"Arctic sea ice loss is matched by Antarctic sea ice gain"
||Arctic sea ice loss is three times greater than Antarctic sea ice gain.
||"Solar cycles cause global warming"
||Over recent decades, the sun has been slightly cooling & is irrelevant to recent global warming.
||"Over 31,000 scientists signed the OISM Petition Project"
||The 'OISM petition' was signed by only a few climatologists.
||"IPCC ‘disappeared’ the Medieval Warm Period"
The IPCC simply updated their temperature history graphs to show the best data available at the time.
||Ozone has only a small effect.
||"Freedom of Information (FOI) requests were ignored"
||An independent inquiry found CRU is a small research unit with limited resources and their rigour and honesty are not in doubt.
||"The IPCC consensus is phoney"
113 nations signed onto the 2007 IPCC report, which is simply a summary of the current body of climate science evidence
||"Tuvalu sea level isn't rising"
||Tuvalu sea level is rising 3 times larger than the global average.
||"Renewables can't provide baseload power"
A number of renewable sources already do provide baseload power, and we don't need renewables to provide a large percentage of baseload power immediately.
||"Ice Sheet losses are overestimated"
||A number of independent measurements find extensive ice loss from Antarctica and Greenland.
||"Melting ice isn't warming the Arctic"
||Melting ice leads to more sunlight being absorbed by water, thus heating the Arctic.
||"Satellite error inflated Great Lakes temperatures"
||Temperature errors in the Great Lakes region are not used in any global temperature records.
||"We're heading into cooling"
||There is no scientific basis for claims that the planet will begin to cool in the near future.
||"CO2 emissions do not correlate withCO2 concentration"
||That humans are causing the rise in atmospheric CO2 is confirmed by multiple isotopic analyses.
||"It's waste heat"
||Greenhouse warming is adding 100 times more heat to the climate than waste heat.
||"It warmed just as fast in 1860-1880 and 1910-1940"
||The warming trend over 1970 to 2001 is greater than warming from both 1860 to 1880 and 1910 to 1940.
||"Record high snow cover was set in winter 2008/2009"
||Winter snow cover in 2008/2009 was average while the long-term trend in spring, summer, and annual snow cover is rapid decline.
||"Venus doesn't have a runaway greenhouse effect"
Venus very likely underwent a runaway or ‘moist’ greenhouse phase earlier in its history, and today is kept hot by a dense CO2 atmosphere.
||"Positive feedback means runaway warming"
||Positive feedback won't lead to runaway warming; diminishing returns on feedback cycles limit the amplification.
||"Water levels correlate with sunspots"
||This detail is irrelevant to the observation of global warming caused by humans.
||"It's internal variability"
Internal variability can only account for small amounts of warming and cooling over periods of decades, and scientific studies have consistently shown that it cannot account for the global warming over the past century.
||CFCs contribute at a small level.
||"Warming causes CO2 rise"
||Recent warming is due to rising CO2.
||"Renewable energy investment kills jobs"
||Investment in renewable energy creates more jobs than investment in fossil fuel energy.
||"DMI show cooling Arctic"
||While summer maximums have showed little trend, the annual average Arctic temperature has risen sharply in recent decades.
||"Royal Society embraces skepticism"
||The Royal Society still strongly state that human activity is the dominant cause of global warming.
||"97% consensus on human-caused global warming has been disproven"
The 97% consensus has been independently confirmed by a number of different approaches and lines of evidence.
||"CO2 only causes 35% of global warming"
CO2 and corresponding water vapor feedback are the biggest cause of global warming.
||"Arctic sea ice extent was lower in the past"
Current Arctic sea ice extent is the lowest in the past several thousand years.
||"Ljungqvist broke the hockey stick"
Ljungqvist's temperature reconstruction is very similar to other reconstructions by Moberg and Mann.
||"Removing all CO2 would make little difference"
||Removing CO2 would cause most water in the air to rain out and cancel most of the greenhouse effect.
||"Heatwaves have happened before"
Global warming is increasing the frequency, duration and intensity of heat waves.