The phrase "topic of increasing importance" is grammatically correct and can be used in written English.
You can use this phrase when discussing a subject that is becoming more significant or relevant in society, or in a specific field of study. Example: "Climate change is a topic of increasing importance, with global temperatures continuing to rise and the impact on our planet becoming more severe each year."
Food sustainability is a topic of increasing importance as environmental concerns loom large.
The problem of nuclear reactor ageing is a topic of increasing importance in nuclear safety recent years.
Graphene, in its pure or derivative form has been a topic of increasing importance in the scientific community for many years.
Urban rainfall runoff has been a topic of increasing importance over the past years, a result of both the increase in impervious land area arising from constant urban growth and the effects of climate change on urban drainage.
In 2014, the NNRR addressed the science of caregiving, a topic of increasing importance given that more people are living with chronic conditions and that managing chronic illness is shifting from providers to individuals, their families, and the communities where they live.
This is the most comprehensive analysis to date of the adequacy lawsuit strategy, a topic of increasing importance in a controversial area of public policy that touches virtually all Americans.
Information system security and network security are topics of increasing importance in the information society.
This topic is of increasing importance given that human dietary habits are rapidly changing on a global scale with a continuous population growth.
Preconception care for women with chronic health conditions is clearly a topic of increasing interest for researchers and of increasing importance for health care providers and policy makers.
The tourist trade is of increasing importance.
Tourism is of increasing importance.
