While sport climbing is common in many areas worldwide, it is heavily restricted in some places where it is considered ethically unacceptable to bolt climbs. This is largely due to the local climbing traditions, and to the type of rock; for instance, it is often considered reasonable to bolt limestone or slate quarries in the UK, especially if these are otherwise unprotectable, but it is considered completely unacceptable to bolt gritstone regardless as to how dangerous a climbing route might be. Debates over bolting in the climbing communities are often fierce. Bolting without a consensus in favour of bolting generally leads to the destruction, or removal, of the bolts by activists against bolting.