They deny the flood and the common sense that indicates the Earth and Universe are just not that old. The carbon dating is skewed b/c Noah’s Flood would have buried all the land animals and plants on Earth. The 2nd link below provides a graph that adjusts carbon dating for just such a problem.
101 Evidences for a Young Age of the Earth...And the Universe
http://creation.com/age-of-the-earth
Center for Scientific Creation - In the Beginning: Compelling Evidence for Creation and the Flood
http://www.creationscience.com/onlinebook/IntheBeginningTOC.html
Einstein posited gravitational time dilation which thereby allows for apparent faster movement of time and space in lower gravitational fields - just another fact that is often overlooked when they choose to ascribe millions and billions of years to rocks, planets and starlight.
Starlight and Time by Russell Humpheys
The key to the starlight and age of the universe is ‘gravitational time dilation’.
What????
Did it bury all the nitrogen too? Zoinks!