ENVT-1107-M01-2025-26 Landscape Design (Term 2 week 13)

Designing for a Changing Climate

Climate change is no longer a distant concern for designers it's the brief. As a landscape architecture student, I've been working through what sustainable design actually means in practice: not as a marketing word, but as a discipline of decisions about materials, ecologies, and people. These are my reflections from a recent lecture, with the concepts pulled together and grounded in real sites I've been thinking about, including Baltic Wharf in Bristol, Coate Water Country Park in Swindon, Thetford Forest in East Anglia, and the North Kent Downs.

Why this matters now

The international framework is well established. The UN Framework Convention on Climate Change was signed in 1992, and at COP21 in Paris (2015), countries agreed to a legally binding treaty to keep global warming well below 1.5°C above pre-industrial levels. The UN's own assessments now suggest we are significantly off track.

The UK has set increasingly ambitious domestic targets in response: a 60% reduction in CO₂ emissions below 1990 levels by 2050 (committed in 2003), tightened to 80% in 2008, and replaced in 2019 by a commitment to reach net zero greenhouse gas emissions by 2050. By 2022, UK emissions had fallen by around 50% compared to 1990 levels — real progress, but the next half is the harder half. A key milestone is the full decarbonisation of the UK power system by 2035, which has direct implications for how we specify lighting, irrigation, and any active systems on a site.

Meanwhile, extreme weather events are arriving faster than the policy response: the Kenya drought of 2021, the US forest fires of 2022, the European heatwave of July 2022, and the Spanish floods of 2024 are all reminders that adaptation is no longer optional.

Mitigation and adaptation: the two halves of the response

Climate-conscious design works on two fronts simultaneously.

Mitigation is about reducing emissions — the carbon we put into the atmosphere through how we build and maintain places. Adaptation is about preparing landscapes to cope with the climate we've already locked in. Adaptation responses tend to fall into three modes:

• Resistance — holding back the change. The Thames Barrier in London is the classic example: a hard engineered defence designed to keep tidal surge out.

• Resilience — absorbing change and bouncing back. Wetland restoration projects, like those in the Mersey Valley around Flixton in Greater Manchester, allow flood water to be received, slowed, and processed rather than fought.

• Transformation — accepting that the system itself must change. Elmley National Nature Reserve in Kent uses a substantial sea wall to maintain a freshwater habitat in a landscape that would otherwise become saline — a deliberate transformation of what the place is for.

The choice between these modes is rarely just technical. It carries assumptions about permanence, control, and what we value about a place.

What sustainable design actually does

A useful way to frame the principles is to look at where the work happens:

• Existing buildings are upgraded to improve environmental performance and comfort, avoiding the carbon cost of demolition and rebuild.

• New buildings are designed to minimise the energy needed to heat and power them.

• Materials are selected to reduce the consumption of primary resources and the embodied emissions of manufacture.

• Communities are designed to encourage walking, cycling, and public transport — shifting daily life away from car dependency.

• Habitats are protected, enhanced, and newly created.

• Parks and open spaces are designed for amenity, health, and wellbeing.

• Water is managed to reduce pollution, lower flood risk, and benefit wildlife and recreation.

These aren't separate concerns — a well-designed wetland edge can deliver flood resilience, biodiversity, carbon sequestration, and a place to walk on a Sunday morning, all at once. That layering is the discipline.

Frameworks for thinking it through

Several tools structure how this gets implemented. The RIBA Plan of Work sequences sustainability decisions across the stages of a project, so issues like material choice and energy strategy are addressed early rather than retrofitted. Life Cycle Assessment (LCA) looks at a construction project from raw materials, through transport to site, through maintenance, and through to end-of-life — at which point elements should be designed for recycling or reuse. The inputs (water, energy, fire) and outputs (climate change impact, water extraction, human toxicity) are tracked across the whole arc.

The Elemental tool organises landscape sustainability around six keystones: materials management, soils, water and air, biodiversity, people and place, and carbon emissions. It's a helpful mental checklist when developing a scheme.

Carbon, in detail

Carbon literacy is becoming a basic professional skill. The vocabulary is worth learning:

• Operational carbon — emissions from running a place (lighting, mowing, pumping, heating).

• Embodied carbon — emissions locked into materials through extraction, manufacture, and transport, before a single user has set foot on site.

• Carbon sequestration — the carbon a landscape actively absorbs and stores in soils, biomass, and wetlands.

• Carbon factor — the emissions intensity associated with a given material or activity.

• Environmental Product Declarations (EPDs) — standardised documents that allow specifiers to compare the environmental performance of materials.

• Environmental markets — the financial mechanisms (such as biodiversity net gain credits and carbon offsets) emerging around these metrics.

For a planting-led designer, the interesting tension is that the most carbon-intelligent landscape is often also the most ecologically rich one. A naturalistic, low-intervention scheme on healthy soils sequesters carbon, supports biodiversity, and reduces operational emissions all at once.

Bringing it back to a site

The lecture closed on a prompt I'm still sitting with: make this relevant for my site. For something like Thetford Forest, where climate change is already shifting which species can thrive, the framework points clearly at transformation — not trying to preserve the existing conifer monoculture, but planning a species mix suited to the climate of 2050, not 1950. For a coastal site like Baltic Wharf, resilience and resistance both come into play around tidal risk. For Coate Water, the questions are about water quality, habitat connectivity, and how the park functions in heatwaves.

What I'm taking away is that sustainable design isn't a stage of a project or a layer added at the end. It's the lens. Every line on a drawing is a carbon decision, a habitat decision, a water decision. The job is to make those decisions consciously.