"We are a long, long way from being able to reconstruct the DNA of extinct creatures, and in fact it may be impossible to resurrect the DNA of dinosaurs or other long-extinct forms. ... No one has been able to demonstrate incontrovertibly, as of yet, that they can retrieve DNA from an extinct species.

Can dinosaurs survive today?

The sea temperature averaged 37ºC, so even tropical seas today would be too cold for marine life of the time. But land dinosaurs would be quite comfortable with the climate of tropical and semi-tropical parts of the world.

Can we revive the T Rex?

It's not possible. The limit of DNA survival, which we'd need for de-extinction, is probably around one million years or less. Dinosaurs had been gone for a very long time by then.