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1.
https://skepticalscience.com/oneliners.php #45
Question: Other planets are warming
Response: Mars and Jupiter are not warming, and anyway the sun has recently been cooling slightly. There are three fundamental flaws in the 'other planets are warming' argument. Not all planets in the solar system are warming. The sun has shown no long term trend since 1950 and in fact has shown a slight cooling trend in recent decades. There are explanations for why other planets are warming.
2.
https://skepticalscience.com/oneliners.php #2
Question: It's the sun
Response: In the last 35 years of global warming, sun and climate have been going in opposite directions In the last 35 years of global warming, the sun has shown a slight cooling trend. Sun and climate have been going in opposite directions.
3.
https://skepticalscience.com/oneliners.php #49
Question: We're coming out of the Little Ice Age
Response: Scientists have determined that the factors which caused the Little Ice Age cooling are not currently causing global warming. The main driver of the warming from the Little Ice Age to 1940 was the warming sun with a small contribution from volcanic activity. However, solar activity leveled off after 1940 and the net influence from sun and volcano since 1940 has been slight cooling. Greenhouse gases have been the main contributor of warming since 1970.
4.
https://skepticalscience.com/oneliners.php #144
Question: The sun is getting hotter
Response: The sun has just had the deepest solar minimum in 100 years. Various independent measurements of solar activity all confirm the sun has shown a slight cooling trend since 1978.
5.
https://skepticalscience.com/oneliners.php #122
Question: A drop in volcanic activity caused warming
Response: Volcanoes have had no warming effect in recent global warming - if anything, a cooling effect. A drop of volcanic activity in the early 20th century may have had a warming effect. However, volcanoes have had no warming effect in the last 40 years of global warming. If anything, they've imposed a slight cooling effect.
6.
https://skepticalscience.com/oneliners.php #91
Question: Solar Cycle Length proves its the sun
Response: The sun has not warmed since 1970 and so cannot be driving global warming. The claim that solar cycle length proves the sun is driving global warming is based on a single study published in 1991. Subsequent research, including a paper by a co-author of the original 1991 paper, finds the opposite conclusion. Solar cycle length as a proxy for solar activity tells us the sun has had very little contribution to global warming since 1975.
7.
https://skepticalscience.com/oneliners.php #52
Question: CO2 was higher in the past
Response: When CO2 was higher in the past, the sun was cooler. When CO2 levels were higher in the past, solar levels were also lower. The combined effect of sun and CO2 matches well with climate.
8.
https://skepticalscience.com/oneliners.php #115
Question: It's global brightening
Response: This is a complex aerosol effect with unclear temperature significance. Global brightening is caused by changes in cloud cover, reflective aerosols and absorbing aerosols. While these changes lead to more sunlight hitting the surface, they also have a cooling effect due to clouds trapping less warmth and absorbing aerosols absorbing less sunlight. The net effect of global brightening is considerably smaller than the forcing from CO2.
9.
https://skepticalscience.com/oneliners.php #84
Question: Jupiter is warming
Response: Jupiter is not warming, and anyway the sun is cooling. Jupiter's climate change is due to shifts in internal turbulence fueled from an internal heat source - the planet radiates twice as much energy as it receives from the sun.
10.
https://skepticalscience.com/oneliners.php #21
Question: It's cosmic rays
Response: Cosmic rays show no trend over the last 30 years & have had little impact on recent global warming. While the link between cosmic rays and cloud cover is yet to be confirmed, more importantly, there has been no correlation between cosmic rays and global temperatures over the last 30 years of global warming.