system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If every country in the world has massive debt ranging from multi billions to trillions of dollars and it is still growing each year, how can any country expect to ever pay it off?

What are the eventual consequences of all this debt buildup and at what point does it mean you must default on that debt (The current Greece situation?).
gpt
No country is expected to pay off their full debt at once. Little parts of that debt come due every day and as long as governments are able to honour the parts of debt that come due + pay interest for all the rest, it's all good.

Greece's big problem is that things put them in a situation where they couldn't keep up with those obligations anymore. If you come to that point, you'll have to make arrangements, but if you cannot or if those arrangements don't save your ass, then you might have to default and deal with the consequences.