CES Ecosystem Management & Sustainability Practices 4

Question 1

Which principle of sustainability states that non-renewable resources should be depleted no faster than renewable substitutes can be developed?

Accepted Answer

Hartwick rule

Answer

The Hartwick rule holds that rents from non-renewable resource extraction should be reinvested in renewable substitutes to maintain constant capital.

Question 2

A certified environmental scientist is evaluating a proposed coastal development. Which analysis best quantifies the economic value of storm protection provided by an existing mangrove forest?

Accepted Answer

Replacement cost method

Answer

The replacement cost method values ecosystem services by calculating the cost of replacing them with human-engineered alternatives (e.g., seawalls).

Question 3

In integrated pest management (IPM), the 'economic threshold' is defined as:

Accepted Answer

The pest density at which control measures are economically justified

Answer

The economic threshold is the pest population density at which the cost of inaction exceeds the cost of control, triggering intervention.

Question 4

The concept of 'planetary boundaries' identifies nine Earth system processes. Which boundary has been most significantly transgressed according to the 2023 update?

Accepted Answer

Biosphere integrity (biodiversity loss)

Answer

Biosphere integrity, especially functional diversity loss, is one of the most severely transgressed planetary boundaries according to current scientific assessments.

Question 5

Which greenhouse gas has the highest 100-year global warming potential (GWP100) on a per-molecule basis among common agricultural emissions?

Accepted Answer

Nitrous oxide (N₂O)

Answer

Nitrous oxide (N₂O) has a GWP100 of approximately 273, far exceeding CO₂ (1) and methane (27–30) among common agricultural emissions.

(CES) Certified Environmental Scientist Practice Test

(CES) Certified Environmental Scientist Practice Test

CES Ecosystem Management & Sustainability Practices 4