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Many of the world’s pollution problems have been caused by the crowding of large groups of people...

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It had far - reaching impact on many aspects of the world.  It restructured the social and political systems in many countries.  It reordered the military powers in the world.  Its effect has stretched all the way to today.  
to which    for which    about which    on which  
How many, they’re    how much , It’s   What’s , It’s    What’s , They’re  
fewer people moved from countryside to the cities  more people moved from countryside to the cities  industry developed less fast  many people moved to the cities without the development of industry  
look at    look for    look around    look on  
were taken    have been taken    will be taken    are taken  
which    that    it    what  
temperature  climate   weather  atmosphere  
look at  look for  look around  look on  
were taken  have been taken  will be taken  are taken  
promotes   rates   regards   ranks  
raising the world's temperature only a few degrees would not do much harm to life on earth  lowering the world's temperature merely a few degrees would lead many major farming areas to disaster  almost no temperature variations have occurred over the past decade  the world's temperature will remain constant in the years to come  
are taken    were taken    will be taken    have been taken  
So what    What for    What if    What’s up  
that, as    as, as    as, that    that, that  
fewer people moved from countryside to the cities  more people moved from countryside to the cities  industry developed less fast  many people moved to the cities without the development of industry