New Good Things From Rubbish

30 trips

The text mentions that 'In countries which still use milk bottles, the average bottle makes about 30 trips to and from the dairy.' This demonstrates the reuse value of glass bottles. Option A (20) is too low, option C (40) is higher than stated, and option D (50) is much higher than mentioned. The correct answer B shows how effectively glass bottles can be reused multiple times before recycling.

Half

The text clearly states that 'Half the world's waste consists of paper.' This statistic shows the significant proportion of paper waste globally. Option A (one-third) underestimates the amount. Option C (one-quarter) is too low. Option D (three-quarters) overestimates the proportion. The correct answer B demonstrates that paper waste forms a major portion of global waste, highlighting the importance of paper recycling.

Japan

The text mentions that 'Japan now makes half its paper by recycling.' This shows Japan's commitment to sustainable paper production. Option A (USA) is mentioned for tree felling, not paper recycling success. Option B (Britain) is mentioned for low glass recovery rates. Option D (India) is mentioned for generally avoiding waste but not specifically for paper recycling achievements. The correct answer C demonstrates Japan's leadership in paper recycling practices.

Green glass

The text states that 'cullet of mixed colours can be used only to make green glass.' This is because mixing different colored glass creates a green tint. Option A (clear glass) cannot be made from mixed colors. Options B (blue) and D (red) are not mentioned as possible outcomes. The correct answer C explains why glass separation by color is important - mixed colors limit the recycling options to green glass only.