Let's concentrate for a while
(i) This mat help us to streamline our idiosyncrasiesWhile @ temporal sense
eg: While i was playing, Mary arrived.
Sally was reading book while Ran was watching television.
She breaths heavily While running.
While @ non-temporal sense (in other words, “while” to mean “although” or “whereas”)
(“Although”: A
Concessive Conjunction which means "in spite of the fact")
The scope of "while "is broad,and it is fine to use while in place of although(according to the need)(ii) River water problem More than 300 rivers drain into Siberia's Lake Baikal, which holds 20 percent of the world's fresh water,
more than all the North American Great Lakes combined.
more than the 300 rivers which drain into
IS MORE THAN all the north American great lakes combined.
(no.of rivers is under consideration)may be all north American Great lakes combines to have only 220 rivers.
While more than 300 rivers drain into it, Siberia's Lake Baikal holds 20 percent of the world's fresh water, which is more than all the North American Great Lakes combined.
Siberia's Lake Baikal holds 20 percent of the world's fresh water IS MORE THAN all the North American Great Lakes combined.
(quantity of water is under consideration)
Fresh water source world wide=3000 million liters,
20% of 3000 million liters is in Siberia's lake= 6000 million liters
which is more than all the north American Great lakes combines(means all the north American Great lakes combines to have less than 6000 million liters of water.
Hope this works !