How does global poverty look?

One thing you'll hear a lot in politics today (and really any time since Reagan) is that 'the rich are getting richer and the poor are getting poorer'. Completely ignoring the truth of the statement (it'd be surprisingly difficult to find a correct answer here; it's a statistical mess), one thing I've noticed is that it's almost always spoken while referring to a single nation, or on those rare occasions where it isn't it's usually about some grouping of OECD countries. But we don't have autarchic nation-state economies anymore, in fact we haven't for a century or more. We have in an already globalized world, one that's becoming increasingly more so every day.

So, what are the statistics like for the world as a whole? With China industrializing, finally, I'm sure any reading of global poverty would show massive atrophy just from that, but China isn't the only fast developing country. Certain countries in Africa have been posting strong real growth for a decade or more. South America, with certain countries acting as exceptions, has been pulling itself out of poverty for decades. Chile is a step short from being a normal, medium income country not all that different from Poland or the Baltic Republics. All over the word globalization is drastically changing the lives of billions of people.

So, how does global poverty look today versus thirty years ago? I've made some cursory searches but it's surprisingly difficult to find reliable data on the matter.