Which part of the MT paper do you believe illustrates whatever point you’re trying to make?
The only reference to global warming I could find is:
In Fig. 5, we gave the yearly number of days n in which a severe (L ≥ 10 km) tornado occurred and in Fig. 6, the yearly total number NY and yearly total path length LY of severe tornadoes. There are systematic increases of all three quantities (n, NY, LY) from 1981–2010, but also considerable scatter. Thus, we hesitate to attribute these increases to causes such as global warming or another external source.
(my bold)
In fact, none of the words ‘climate’, ‘temperature’, ‘greenhouse’ or ‘CO2′ appear anywhere in the paper.