Two reasons to justify this statement:
Source: Chapter 13, Section 13.2.2 — Managing the Garbage we Produce
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The textbook explicitly states: "Improvements in our life-style have resulted in greater amounts of waste material generation. Changes in attitude also have a role to play, with more and more things we use becoming disposable. Changes in packaging have resulted in much of our waste becoming non-biodegradable."
Examiners expect students to pick two distinct reasons from these three cues — disposable culture, changed attitudes, or non-biodegradable packaging. Avoid vague answers; link each point clearly to waste generation.