The benefits of higher CO2 levels for crops have been known for a century; this photo contrasting large potatoes grown with extra CO2 to small potatoes grown without it from a 1920 Scientific American article.

If you'd like to learn more about climate change, here are some trustworthy resources

Introductions:  introductions

1. “Climate Curious,” by environmentalist David Siegel: What he learned about climate change.

2. PragerU: What Science Reveals About Climate Change (videos).

Debates:  debates

3. BestSchools: Karoly/Tamblyn—Happer Dialogue on Global Warming, 2016-2017. An in-depth, balanced, written debate, between leading experts on both sides of the issue.

4. SOHO Forum debate: Is Carbon Dioxide Endangering the Planet? Craig Idso vs. Jeffrey Bennett. (video). April 15, 2019 debate between a top climate expert on each side of the issue, at The SOHO Forum in Manhattan. 

5. IQ2US Debate: Is Global Warming A Crisis? (video). 2007 televised debate between three top climate experts on each side, which is still surprisingly timely. 

(see also: #10, below, the 2014 APS Workshop)

Amicus brief:  amicus brief

6. Three top scientists briefed the judge on climate science, in the 2018 Calif v. BP lawsuit. It was educational for him, and it probably will be for you, too.

Physics & geophysics:  physics

7. 2014 UNC Physics Colloquium by Princeton atmospheric physicist Prof. Will Happer.

8. Wilson, 2012, Simple model to estimate the contribution of atmospheric CO2 to the Earth's greenhouse effect.

9. Pierrehumbert, 2011, Infrared radiation and planetary temperature (and discussion).
10. In 2014, the American Physical Society held a seven hour long “Climate Change Statement Review Workshop,” in which a panel of leading climate experts discussed the science of climate change, including a lot of discussion of climate sensitivity. The transcript is a daunting 573 pages long, but only about 135 words per page, and very educational.

Sea-level rise is not accelerating:  Honolulu sea-level vs. CO2

11. (shameless promotion of my own web site -DAB).

12. Clickable thumbnails for NOAA's entire 2016 list of 375 long term trend tide stations.

13. “Acceleration” primer. (Do you know how to recognize “acceleration” in a graph?)

Hurricanes & tropical cyclones are not worsening hurricane frequency

14. Lin & Chan (2015), Recent decrease in typhoon destructive potential and global warming implications. Nature Communications, doi:10.1038/ncomms8182.

15. Global Hurricane Frequency graph (twelve month running sums).

16. Global Tropical Cyclone Accumulated Cyclone Energy graph (ACE) (or similar graph from

Tornadoes are not worsening:  tornadoes

17. 2018 US tornadoes lowest in 65 years of record-keeping, by meteorologist Anthony Watts.

18. NOAA: U.S. Annual Count of Strong to Violent Tornadoes (F3+), 1954 through 2014 (graph).

19. WoodTV: Strong to Violent Tornadoes in the U.S. Trending Downward, by meteorologist Bill Steffen (graph).

Droughts are not worsening:  droughts

20. Global integrated drought monitoring and prediction system (and graph).

21. NOAA NCDC: U.S. percentage very wet or very dry (and graph).

What about feedbacks?  droughts

22. Learn about “climate feedbacks.” Dozens of “feedback mechanisms” affect the Earth's climate. Some are “positive” (amplifying), others are “negative” (attenuating). This is my web page on the topic. -DAB

What about the claimed “97% consensus”?  consensus defined

23. Q: Is there a 97% consensus for climate alarmism,
or did over 30,000 scientists say global warming is a hoax?
23. A: Neither. The best evidence is that manmade climate change is real, but modest and benign. The only consensus is that emissions of so-called “greenhouse gases” (GHGs) do help warm the Earth. There's no consensus that it's harmful.

Benefits of rising CO2 levels…  Greening Earth: spatial patterns

…for deserts & natural ecosystems:
24. “Greening” the Earth.

…and for agriculture:
25. Carbonic Acid Gas to Fertilize the Air, Scientific American, Nov. 27, 1920.
Greening Earth: spatial patterns
26. The Center for the Study of Carbon Dioxide and Global Change (“CO2 Science”) is a 501(c)(3) educational charity, dedicated to factual climate science. They maintain a huge and extremely useful plant growth database, which catalogs scientific studies of the effects of varying CO2 levels on hundreds of plants.

27. The CO2 Coalition is another 501(c)(3) educational charity, with a powerhouse board of scientific experts, dedicated to promoting scientific accuracy about the effects of CO2 emissions. (Note: I am a member. -DAB)

28. The Global Warming Policy Foundation (GWPF) is a UK educational charity and think tank, with a prestigious Academic Advisory Council, focused on analysis of climate-related public policies and their economic and environmental implications. They've produced a superb series of in-depth reports (like this one on The Good News About Carbon Dioxide), shorter briefing papers, notes, essays and lectures.

29. Famine Increased agricultural productivity due to rising CO2 level is one of the reasons that famines are becoming increasingly rare, for the first time in human history.
That's a very, very Big Deal. Famine used to be a scourge comparable to war and epidemic. For comparison: WWII killed 2.7% of the world's population, and the catastrophic 1918 flu pandemic killed about 2% of the world's population. But the global drought and famine of 1876-78 killed about 3.7% of the worlds population! 

30. Arrhenius One of the fathers of modern climatology was the great Swedish scientist, Svante Arrhenius. He was the first person to quantify the warming effect of mankind's CO2 emissions, and correctly predict that it would benefit agriculture. He even predicted what is now called “polar amplification.” In a 1908 book he wrote, "By the influence of the increasing percentage of carbonic acid in the atmosphere, we may hope to enjoy ages with… better climates,… when the earth will bring forth much more abundant crops than at present, for the benefit of rapidly propagating mankind." 

Six Top climate blogs:   WUWT

…For news, analysis & discussion:
31. Watts Up With That (“WUWT”), by Anthony Watts.

…For in-depth analysis: (realist/skeptical/lukewarmist)
32. Climate Etc. by Judith Curry.
33. Climate Audit, by Steve McIntyre.

…and, for balance, the three best alarmist blogs:
34. Moyhu, by Nick Stokes.
35. Science of Doom, by Steve Carson.
36. All Models Are Wrong (but some are useful), by Tamsin Edwards.

Note: blogs which are censored to suppress dissent are not listed. That unfortunately includes several prominent alarmist blogs. That's why I could only find three alarmist blogs to recommend.
  So, to maintain balance, I also only list three realist blogs, and omit other excellent realist blogs, like JoNova.

37. Want more? I also maintain a long list of climate blogs and other useful sites, and I've written many Quora Answers on climate change (including one which is very similar to this web page).