Evidence of the harm caused by fracking is mounting all the time and is overwhelming.

For a whole load more evidence see Mounting Evidence: The Harm Caused By Fracking

which includes the impacts of:

UK Specific
Water Contamination
Air Pollution
Radioactive Contamination
Human Health
Agriculture & Animal Health
Wildlife
Methane Migration
Climate Change
Fracking Waste
Water Usage
Earthquakes
Transport
Pipelines
Blowouts, Spills & Explosions
Frack Sand
Leaking Wells
Orphaned Wells
Industrialisation
Secrecy
Oppression
Corruption
Economics