An unchecked increase in the use of fossil fuels <i>could</i> have catastrophic results for the planet.<br/><br/>An unchecked increase in the use of fossil fuels <i>can</i> have catastrophic results for the planet.<br/><br/>Hi,<br/><br/>What are the possible differences between these two sentences? <br/><br/>Thank you.<br/><br/>Best wishes,<br/><br/>PBF