In 10 Seconds? Recent research human-caused climate change makes tornado-prone weather more ‘favorable'. However, none of the two papers puts numbers on what ‘favorable’ may mean. And they don’t explain what a changing weather might affect tornadoes.
This sounds unhelpfully vague, so what is the point? First, the two recent papers (see above) show how difficult the science is and how much more knowledge we need to give an exact answer. Even defining “tornado” is not straightforward, so each paper investigates complicated parameters of tornado formation including available energy, rotation potential, and how air is stopped from rising which is a critical element in these phenomena.