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The IMF revised the global growth figures downward by 0.2 per cent for each year - 3.4 for 2016, and 3.6 per cent for 2017.
Russia says it will continue to bomb Islamic State and Al-Nusra forces.
The Turkish president's threats come as Kerry and Lavrov announce an interim ceasefire.
The runoff comes after no one gained a majority vote in December elections.
More than 100 aid trucks began leaving Damascus headed toward besieged towns on Wednesday.
But it wasn't enough for energy investors as oil prices again sank below $30 a barrel.
Analysts speculate that OPEC and Russia could agree to a production freeze.
Boko Haram's wave of violence remains unabated despite an African coalition of armies fighting the Islamist group.
The deal comes as a Syrian group says 470,000 have been killed in the five-year conflict.
Increasing population growth could outpace current progress and undo the successes of the past decades.