___________ we invest in renewable energy sources for a sustainable future?

• What if (idiom)
English Meaning: used to ask about something that could happen in the future, especially something bad.
Bangla Meaning: কী হতো যদি।

Complete Sentence: What if we invest in renewable energy sources for a sustainable future?

Example Sentence:
1. What if we decided to take a spontaneous road trip this weekend?
2. What if your dream job is just a phone call away?
3. What if the bus is late?
4. What if you don't pass your exams?

Source:
1. Cambridge Dictionary.
2. Accessible Dictionary by Bangla Academy.