Well, to put it simply, nearly everything related to technology and research would be wiped out, unless it is some theoretical physics related stuff or advanced mathematics or something else as abstract as those.
The solar storm would be the worst of all. An end to electricity lines would mean the imminent collapse of all technological advancements we have made so far. No electricity means no computers, no production lines, no light bulbs (maybe some would go on for a while on batteries), no refrigeration ... and on the chilling side ... nearly 70% of medical services in hospitals would be rendered useless!
The world war between Europe and Asia killing around 1.2 billion people would most certainly involve nuclear bombs, rendering a lot of are uninhabitable and deserted. This would also result in massive scale water and atmosphere contamination, killing nearly all freshwater fish in the affected regions and destroying all crops. Those who did not die directly of the bombs and explosions would die a slow, miserable death out of famine, disease and lack of resources. With a life loss in the scale of a billion, you can pretty much be sure another billion or two would die due to the collapse of society and government.
So then, by 2016 the world population would be reduced to a billion or so. Most of the survivors being located in radiation free zones such as Australia, New Zealand, Africa and South America. Africa would probably be survivor paradise due to its relative abundance of food sources in the form of wild game and would be left with some shred of civilization.
Since Australia would is located so far off and does not participate in controversial warring, it too, would probably survive the catastrophe. However, due to the sudden outage of power, it would be pushed back some 200 years in terms of life standard and technology. Same applies to New Zealand.
The destruction would be long term. World, as a whole, would be pushed back 200 - 300 years in terms of technological advancement with no hope of a quick enough recovery. Asia, Europe and North America would be particularly the hardest hit regions where vast swathes of land would be rendered unusable for humans for at least 50 years or so.
If some people do survive for more than 20 years in Africa and South America (excluding Australia and New Zealand due to their extreme dependence on technology and foodstuffs imports), they would have a hope of gradually repopulating the earth and beginning the story of technological advancement all over again.