-- 100-year average temperature rising
-- percentage of carbon-dioxide in the atmosphere rising
-- average high temperatures for a year rising
-- temperatures of the oceans rising
-- severe weather events happening more often
-- large, energetic storms happening more often
-- glaciers shrinking
-- polar ice shrinkikng
-- habitat for animals in polar zones shrinking
-- temperate-zone trees and plants spreading toward the poles
-- growing seasons getting longer
-- dry areas getting more heavy rain events
-- rainy areas having more extended dry periods
Note:
Everything on this list IS being observed.
You can argue about what's causing it, but
you can no longer claim that it's not happening.