Anyone ever watch the movie "The Day After Tomorrow"?
Global warming results in melting of arctic ice. Permafrost recedes. This in turn affects the arctic jet stream shifting it over and it means that the Northeastern U.S. experiences colder winters with polar vortexes and bomb cyclones becoming more common and to have much wetter Springs/Summers. Meanwhile other parts of the country will experience multi year drought.
Climate is cyclical and polar ice has advanced and receded, but usually change is more gradual. Interference by man has accelerated the changes.
The Little Ice Age occurred between 1250 and 1850. There were three interglacial periods with slight warm periods between them. Speculation was that changes in solar radiation, increased volcanism and the cyclical nature of climate were factors. Major events that happened that was related to weather was the Spanish Flu pandemic of 1918 that took 50 million lives, mostly young and healthy. Other flu pandemics of 1957,1968, 2009 are also linked to El Nina conditions and population changes and distribution during or following periods of war. Donner-Reed party in 1846-1847 that perished when they were snow bound in Sierra Nevada on their way to California.
Extreme volcanism can cause global cooling due to dust particles and release of green house gasses blocking solar light. The effects can last for months or years. Krakatoa, Mt. St. Helena, Tambora, Vesuvius, Yellowstone, and the Long Valley Caldera. The latter two would have world changing effects when they erupt again.
Climate change affects agriculture, fish and animal migration patterns. Warmer weather increases number of planting days, but extremes of storms, floods, and drought can ruin the crops as we have seen this year in the Midwest. Plants are affected by climate change more than animals since they can't just uproot themselves and leave. Warmer temperatures mean that less heat tolerant crops won't do well. Less food for animals and people too, and more food insecurity. Scarcity usually leads to conflict. The warming trend is unlikely to ease up anytime soon. In terms of global climate a few hundred years is but a moment in time. To adapt now, we have to look for alternatives to find ways to conserve clean water, efficient use of irrigation, and selecting for crops more resistant to heat and drought.
https://www.nationalgeographic.com/news ... hange-spd/
Happy gardening in Hawaii. Gardens are where people grow.