General verbs:
* Change: "The climate is changing rapidly."
* Vary: "Climates vary greatly around the world."
* Impact: "Climate impacts weather patterns."
* Influence: "Climate influences plant and animal life."
* Affect: "Climate affects human societies."
Specific verbs:
* Warm: "The climate is warming."
* Cool: "The climate is cooling."
* Dry: "The climate is drying."
* Wet: "The climate is getting wetter."
* Moderate: "The climate is moderating."
* Stabilize: "We need to stabilize the climate."
The best verb to use will depend on the specific sentence and the intended meaning.