The Prince of Wales said it was important to "work in harmony with nature" and spoke of his concerns for Britain's rural areas in a special edition of the BBC One flagship Countryfile programme.
The soon-to-be grandfather added that "we need to think about what kind of world we're handing on to our successors."
Charles spoke to Countryfile presenters Julia Bradbury and Matt Baker after he agreed to guest-edit the weekly rural affairs show, which airs tomorrow, as part of its 25th anniversary celebrations.
Asked by presenter Ms Bradbury whether the prospect of becoming a grandfather made him feel old, the 64-year-old Prince replied:
The Prince of Wales also talked about his favourite countryside activities, which include walking and building hedges.
Speaking about his passion for hedge-building, he added:
Countryfile: A Royal Appointment will air on BBC One and BBC One HD tomorrow at 7pm.