Propaganda 101: Overload the meaning of a term with:
1) Something that exists (changes in climate)
2) Something you claim exists (dangerous changes in climate due to human activity)
And then point out instances of 1 in a way that makes people assume instances of 2. When called out on it to defend your assertion, you can point out how it is an instance of 1.
3). Renewable energy...... there is no such thing