As is subtly portrayed in the cartoon,two tourists are sightseeing on a small boat while discarding their picnic leftovers casually into a lake.Unfortunately,the lake is already filled with litter and teaming with flowing rubbish like plastic containers,fish-bones,banana peels,watermelon rinds,bottles,tins,food wrappings,and so on.And below the drawing,there is a caption which says:"after" the travel or "me" in the travel.

From the portrayal,we can conclude that the painter wants to convey such a message:a good many scenic spots are flooded with visitors,who spoil the beauty of nature by creating and leaving behind God-knows-how-much trash.On the one hand,tourism,as a multibillion-dollar business,is booming everywhere.Some people,under the belief that tourism serves as an engine of economic growth,seem to ignore its negative effects on the environment.Nevertheless there are not concerns that we can shrug off lightly.On the other hand,tourism has exerted great pressure on the environment we are living in:our water is polluted,our ecological system is disturbed,and our natural resources have been excessively used.

Undoubtedly,tourism cannot be banned in any country,as it does help to shore up the economy in places which have few sources of income.However,the main point is that the unchecked growth of the travel business may render the development of an economy unsustainable.It is high time that we enhanced people's awareness to rectify this by taking environmental protection into consideration.