what was the world's wealth in 2015? I was reading an article from 2015 stating that 1% of the world has half of the world wealth. They have several figures such as the world's billionaries have around 7 trillions dollars or the global world wealth pyramid which shows a percent of population by percent of the total wealth etc. but I can't see anywhere a figure of the total wealth of the world. Which is it?
Your article probably resulted from an Oxfam campaign

If you believe table 2 of a January 2015 Oxfam report then about $\$250$ trillion. The campaign spliced together some information from Forbes on the richest $x$ individuals and a series of Credit Suisse reports - see the bottom of page 94 

The analysis has faced criticism: it concentrates on individual assets and liabilities, e.g. a US doctor whose student debt exceeds personal financial assets counts as poorer than a subsistence farmer in Africa, and uses a very large amount of estimation, so other reasonable calculations could be very different