Global warming is happening because the climate is changing.
Climate is a trend over a long time in one location, or area, not one hot summer, or one cold winter in one place, or even a larger part of the word, like the continent of Europe.
Global warming is a change of climate over the entire planet earth and on average over a long period of time (decades/centuries)
What can cause climate change?
Large Vulcanic eruption, or a nuclear war, can cause large amount of particles in the stratosphere that blocks sunlight, thus cooling of the planet for a period. If that period is long it is climate change. Water vapor has the same effect caused by more cloud cover, which has a cooling effect.
Melting sea ice due to warmer Arctic climate means more open water, which means less heat reflection, thus causing more warming, causing more ice to melt.
Particles pollution from burning forest, or unfiltered exhaust from coal or oil fired power stations has mostly local effect, causing acid rain downwind from major sources.
Sometimes particles spread with the jet streams and fall on glaciers, snowy mountains and field far away as “black snow”, which also result in less reflection.
The amount of certain gasses in the atmosphere has a major effect on global climate CO2 is well known as a GHG, but methane has a much larger effect relative to PPM count in the atmosphere. Much of the GHG emission is manmade, directly or indirectly.
Warming of the Arctic cause melting of the permafrost, which release methane that has been stored away for centuries, causing more GHG, causing more warming.
Melting of the permafrost is initially cause by warming of the rest of the planer, but becomes self-generating once it reach a certain level.
You are right; it is not as simple as either the “doomsayers”, or the “naysayers” make it out to be. But if we wait until one or the other becomes proven it MAY be too late.
PS> I don’t expect to be here to see it any which way it goes.