Step 1: Understand the concept of energy crisis.
An energy crisis refers to the shortage of energy resources and the need to use them efficiently and sustainably.
Step 2: Evaluate each statement.
(A) Increasing the use of solar cookers promotes renewable energy — true
(B) Increasing the use of non–renewable sources worsens depletion — false
(C) Using waste materials as energy (biogas, waste-to-energy) — true
(D) Saving water helps in conserving hydroelectric energy — true
Step 3: Final conclusion.
The false statement is option \(\boxed{\text{(B)}}\).