A falsifiable claim is one that can be observed, tested, and proved to be false. For the last 40 years or so, the GW/CC alarmists have made numerous claims that turned out to be false. Ice-free Arctic ocean, Florida under water, etc. Such claims were falsifiable then as they are now. Should we be spending billions on falsifiable claims and questionable solutions at a time when our national debt is going crazy?
IMHO, that does not mean that GW/CC isn't affected by anthropogenic causes, but the question is by how much AND what we can do about it. Anybody who claims to know the answers to those questions is lying, or at best misinformed. Sadly, the issue has been heavily politicized, and truth takes a back seat to power and greed.