Unfortunately, there's an incredibly huge gap between "loss of coastal regions" and "Earth becomes a second Venus"
And you are basing this on what, exactly? Because the answer right now to that question is "we don't know how huge that gap is". And we do not have a second Earth to test your theories on. Are you really willing to take the risk of assured doom based on your belief that "the gap between now and assured doom is incredibly huge"?
Here's the thing with dynamic equilibrium: it is only locally stable. We do not know how exactly how resilient our ecosystem or our planet is to rapid changes. Some of us are not willing to find out, because we only have a single destructive test at our disposal.
And you are basing this on what, exactly? Because the answer right now to that question is "we don't know how huge that gap is". And we do not have a second Earth to test your theories on. Are you really willing to take the risk of assured doom based on your belief that "the gap between now and assured doom is incredibly huge"?
Here's the thing with dynamic equilibrium: it is only locally stable. We do not know how exactly how resilient our ecosystem or our planet is to rapid changes. Some of us are not willing to find out, because we only have a single destructive test at our disposal.