The phrase "a global topic" is correct and usable in written English.
It can be used when discussing subjects that have worldwide relevance or impact.
Example: "Climate change is a global topic that affects every nation on the planet."
Alternatives: "an international issue" or "a worldwide subject".
With climate change being a global topic right now, did that spark this initiative or have you always had your heart on conservation?
More generally, we have an issue that is not only French — it is a global topic that affects the U.S., Europe, France, Germany… It's all about removing content from online platforms and sharing the responsibility.
As religion is a global topic, HuffPost's editors around the world are focused on lifting up stories that feature courageous people from all (and no) faith traditions who are using the power of spirituality and philosophy to create peace.
Currently, the development of new cancer vaccines is a global topic and has attracted attention as one of the most important issues in Japan.
(9) Currently, the development of new cancer vaccines is a global topic and has attracted attention as one of the most important issues in Japan.
Rape has become a ubiquitous global topic, and that is encouraging since it is a global blot on our collective humanity.
As several thousand reporters move on to New Hampshire, the local talk will turn from caucusing to a more global topic: weather.
The Winter Forum is a two-and-a-half day event immediately before the start of spring semester, which brings together 100 undergraduates to explore in depth a challenging global topic.
Despite privacy being an important global topic, it seems the vast majority of people are not making purchasing decisions based on it.
The hype was enough to make #BTSCitifield a top trending global topic on Twitter, with more than 90,000 fans using the hashtag at one point.
Defining something as a global health topic doesn't make it universal.
