What are the differences between the waste management in Sweden and that of some countries in Africa?

赞同蒋老师解答观点 即that指代前面名词 the waste management

解答：that和those除了可以当做指示代词使用，还可以当做“替代词”使用，通常都带有后置定语修饰限定，具有用法如下

替代词that用法

【一】that指代不可数名词的替代词用法。

The price of wheat is higher than that of rice. 小麦的价格比大米高。

The light of the sun is much brighter than that of the moon.太阳的光线要比月亮上的光线强烈得多。

The weather in Nanjing is hotter than that in Beijing.南京的天气要比北京的热。

A dog’s intelligence is much greater than that of a cat. 狗的智慧比猫的高得多

【二】that也可以指代可数名词，指代可数名词时，相当于the one

This story is not so interesting as that  we heard last night.

=This story is not so interesting as the one we heard last night.这个故事不如我们昨晚听到的那一个有趣。

This film is more interesting than that we saw last night.

=This film is more interesting than the one we saw last night.这部电影比我们昨天晚上看的那部有趣得多。

The computer is different from that  we are using.

=The computer is different from the one we are using.这台电脑和我们正用的那台不一样。

A grandparent’s job is easier than that of a parent. 祖父母的任务比父母的任务要轻松一些。

【三】为了避免重复，that还可以指代前面整句话内容

He will ask me to lend him some money and I can’t do that .他问我借点钱，可我不能借。

We see him when he comes to town,but that  isn’t often.他进城时我们能见到他,但是这种情况不常有.

                                       替代词those用法

【一】those指代前面复数可数名词形式，通常带有后置定语加以修饰限定。相当于the ones

The houses of the rich are generally larger than those of the poor．富人的房子通常要比穷人的房子大。

The students in our class work harder than those in their class.我们班的同学比他们班的同学学习更刻苦。