complex problem

“This migration is not something that can be just stopped in 15 days, in two months, or in years. It’s a very complex problem, related to poverty in other countries and the needs of people seeking a better life.”

"It's a global problem. While individuals can protect themselves with air filters and masks, we need a global solution to climate change. It's going to have to be many-pronged -- many people have to be involved to solve this highly complex problem."

“It is a complex problem – but human beings are capable of designing complex solutions to complex problems.”

The prime minister responded that no single policy would be a silver bullet to solve a complex problem, but said the last Labour government had reduced child poverty before and the current one was committed to doing so again.

Reconstructing a full 3D scene from one camera viewpoint is a complex problem.