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can we get a tech in green planet, where we can redirect comets to hit mars for water ?

The official description (everything subject to change up until (and sometimes after) release of course) says:

Special Projects - Take on seven challenging Special Projects like melting the polar caps, capturing ice asteroids, launching a space mirror, and more to begin shifting the Terraforming Parameters. Be careful, these projects will have a lasting impact on the planet and can trigger natural disasters!

"Capturing ice asteroids" would seem to fulfill that.