They can harm the environment because of litter and air pollution but some parks and touristy areas can be benefitted by frequent use which can then also mean that that areas is improved.
Crater Lake affects the environment by attracting tourists who leave litter in the area. This then causes pollution and even affects the wildlife by disturbing mating and nesting in the area.
tourists backpack in order to view differences of environment ,its economy and values
yes
Generally, tourists are awed by the sights in Antarctica and report feeling privileged to have been able to tour this extreme environment.
Miho Funakoshi has written: 'The effect of nationality on the attitudes and behaviour of tourists towards the economy, environment and culture oftheir host country'
tourists backpack in order to view differences of environment ,its economy and values
Tour guides publish and help tourists adhere to a set of guidelines. You can read them, below. This means that most tourists respect and abide by the guidlines. There is, however, the errant tourist who will not abide by them. Generally, there is no or little impact on the Antarctic environment left by tourists.
by stopping people going on weekends
It has an effect on the environment because crimes are in the environment so
Ecotourism.
I beleive it is not if the tourists are careful and that they respect the environment. A classic example would be responsible garbage disposal, if tourists from around the world know how to properly dispose waste then they will not have a problem in pollution or garbage.
Tourism in Antarctica can educate people into what they can be doing back home to reduce their effect on the environment because instead of just telling people what they are doing, they can show them.