Now this is a climatic scene.

A behemoth air-scrubbing high-rise that looks straight out of a sci-fi flick has been designed for the middle of Roosevelt Island.

The tree-studded, 2,400-foot-tall, futuristic proposal is planned to loosely resemble a mandrake plant — with a base like a cruise ship morphing into a gleaming twisty tower a la surrealist Salvador Dali — and take over much of the East River isle off Manhattan.

The residential proposal, by French architecture firm Rescubika, was posted on the Web site designboom last week as part of a “city of tomorrow’’ feature.

The pie-in-the-sky design is all about going green, with its architects telling The Post in a statement Monday, “This project is able to absorb a large amount of carbon and is therefore less polluting for the ecosystem.” Read More.