固碳技术与成本分析

M r 5800 1100 1200 2000 3700 mmt
That is to say, we develop a model that removes 3700 mmt of CO2
Strategy I
Planting Trees
Trees can absorb carbon dioxide. To decrease the amount of carbon dioxide at atmosphere, we could plant more trees. So we create the following model to calculate the cost that achieving national carbon neutrality via planting more trees.
Going Green
Summary
With High rate industry development and global warming, the U.S. has become increasingly conscious of its carbon footprint. It is necessary to take actions that decrease CO2 emissions or increase CO2 consumption. Firstly, we calculate that the U.S. needs to remove 3700 mmt of CO2 per year. We put forward three strategies: Planting Trees, Growing Algae-Based Biodiesel and Carbon Capture and Storage (CCS) to realize the National Carbon Neutrality. Then we calculate the cost, profit and maximum CO2 consumption of three strategies separately. We find the total CO2 consumption per year is 3964.5mmt, which is greater than 3700mmt. So it is an effective method to achieve the carbon neutrality. Then, we discuss the feasibility, effectiveness through calculate the cost, profit and how much CO2 it consumes of each strategy. we turn to installment to reduce the annual finance burden. Considering economical effects, we find CCS is the cheapest method to consume CO2 and planting trees the next. So the investment sequence is CCS Planting Trees Algae . We propose an execution strategy, “Neutrality Project”, and calculate several specific cases according to the accomplishment time. The result shows that shorter project duration means larger amount of total expenditure. Consider lots of factors, we choose a Medium-Long scheme, it will take about 40 years to achieve carbon neutrality, and the cost is approximately $550 billion. At last, we discuss the social impact, it dose influence the lives of some people. However, the overall impact outweighs the slight personal burdens that may ensue. So these strategies are socially feasible.
Key word: Planting Trees, Growing Algae-Based Biodiesel, CCS
Introduction
The strategy that increases CO2 consumption also is known as carbon sequestration. Thus, our task is to find some feasible method that increases carbon sequestration. Besides, we discuss if carbon neutrality is reached and feasible in terms of cost, cultural impact, and effectiveness.
Since the nature is consuming CO2 itself to maintain ecosystem balance, we don’t need to consume all of the CO2 to achieve national carbon neutrality. As a result, first of all, we calculate how much CO2 that we need to consume. The Figure below shows the carbon circle.
which contributes approximately 5800 mmt of carbon per year, and land use changes, which account for another 1100 mmt . In contrast, the oceans absorb from the atmosphere approximately 2000 mmt more of carbon than they release and the earth’s ecosystems appear to be accumulating another 1200 mmt annually. So the annually amount of carbon dioxide that is emitted to atmosphere is M r .
Our model has three models that implement various strategies of carbon sequestration.

Planting Trees Growing Algae-Based Biodiesel Carbon Capture and Storage (CCS)
Symbols and Terminology table

Industry emissions: CO2 emissions that can be controlled and deal with. Atmospheric emissions: CO2 emissions that enter the atmosphere. Namely, it can not be consume manuhe average annual carbon uptake (ACU) in the lifetime:
ACU
1 155 ACUi 155 i 0
To Loblolly Pine , ACU 1.51(tons / acre / year ) To Ponderosa Pine, ACU 1.91(tons / acre / year ) To Black Walnut, ACU 0.55(tons / acre / year ) All appearance，Ponderosa Pine have the most ACU .So we choose Ponderosa Pine as the trees to be planted.
ACU: annual carbon uptake of a acre trees
Ttotal : the total amount of carbon dioxide that is consumed per year


F: initial capital expenditure
Model Design and Strategy

Calculate the total amount of carbon dioxide.
Brownfield which are arable lands that are currently unused occupy an area of S . (After consulting the correlative data we know that S =125,000,000 acres).And the area that one tree occupy is S 0 . (After consulting the correlative data we know that

CO2
CONSUME

Choose Trees
At first, we should make a plan to choose the trees that absorb the most carbon dioxide. The following figure shows that the amount of carbon dioxide that different trees absorb with age.