Just a partial list includes longer growing seasons, higher rainfall, the opening of former hot and cold deserts to the colonization and proliferation of plant and animal life, opening new lands for agriculture, pasturage, forestry and human settlement.
Previous periods of global warming brought huge benefits
Gregory F. Fegel
There is some variation in the intensity of each Quaternary (the current) Ice Age glaciation, and of each warm interglacial — either of warming or of cooling — when we compare each glaciation with the others, and when we compare each interglacial with the others. The three Milankovitch orbital cycles (the eccentricity of the Earth’s orbit, the axial tilt, and the axial precession) interact with each other in a complex way to cause those variations of intensity. The average global temperature during the previous Eemian Interglacial was 1 to 2 degrees Celsius (1.8 to 3.6 degrees Fahrenheit) warmer than during the current Holocene Interglacial. That 1 to 2 degree Celsius difference is relatively small, and it is within the overall parameters of the Ice Age cycle, so it could be accounted for by the variability caused by the interactions of the Milankovitch orbital cycles.
The Anthropogenic Global Warming alarmists warn us that an increase of 2 degrees Celsius in the mean global temperature will bring catastrophe for the environment and for human civilization. It is instructive to know that during the Eemian Interglacial, which was about 2 degrees Celsius warmer than today, the increased rainfall greened large regions of the Earth, the arctic tree line moved much further north, and the eastern half of the North American Prairie was covered with forest, due to the higher annual rainfall caused by the natural global warming.
During the Eemian Interglacial, sea levels rose to 20 or 30 feet higher than today, but the loss of land caused by the higher sea level was richly compensated for by the warmer climate, longer growing seasons, higher rainfall, and the opening of former hot and cold deserts to the colonization and proliferation of plant and animal life. Today such global warming would open new lands for agriculture, pasturage, forestry, human settlement, and nature reserves. https://en.wikipedia.org/wiki/Eemian
Earth on the Brink of an Ice Age
by Gregory F. Fegel
Yes, I agree, these are some of the wonderful benefits of a warmer world. Trouble is, that I see us entering a much colder world; a little ice age leading into a full-fledged ice age.