Where the film goes wrong
Critics have compiled a long list of questionable claims made in the film. I will examine three relating to renewable energy.
1. Solar panels take more energy to produce than they generate
It's true that some energy is required to build solar panels. The same can be said of coal-fired power stations, oil refineries and gas pipelines.
But the claim that solar panels generate less energy in their lifetime than that taken to produce them has long been disproved. It would not be true even if, as the film says, solar panels converted just 8 per cent of the energy they receive into electricity.
But that 8 per cent figure is at least 20 years old. The solar panels now installed on more than two million Australian roofs typically operate at 15-20% efficiency.
2. Renewables can't replace fossil fuels
The film claims green energy is not replacing fossil fuels, and that coal plants cannot be replaced by renewables.
To disprove this claim we need look no further than Australia, where wind turbines and solar panels have significantly reduced our dependence on coal.
In South Australia, for example, the expansion of solar and wind has led to the closure of all coal-fired power stations.
The state now gets most of its power from solar and wind, exporting its surplus to Victoria when its old coal-fired power stations prove unreliable on hot summer days.
What's more, a report released this week by the Australian Energy Market Operator (AEMO) said with the right regulations, renewables could at times supply 75 per cent of electricity in the national electricity market by 2025.
3. Solar and wind need fossil fuel back-up
Some renewables systems use gas turbines to fill the gap when the wind isn't blowing and the sun isn't shining. However, renewable energy storage is a cleaner option and is fast becoming cheaper and more widely used.
AEMO forecasts battery storage installations will rise from a low base today to reach 5.6 gigawatts by 2036–37. The costs of storage are also projected to fall faster than previously expected.
South Australia's famous grid-scale Tesla battery is being expanded. And the New South Wales government's pumped hydro plan shows how by 2040, the state could get 89 per cent of its power from solar and wind, backed by pumped hydro storage.
In Australia on Easter Saturday this year, renewables supplied 50 per cent of the national electricity market, which serves the vast majority of the population.
Countries such as New Zealand and Iceland essentially get all their power from renewables, backed up by storage (predominantly hydro).
And putting aside the federal government's problematic Snowy 2.0 project, Australia could get all its energy from renewables with small-scale storage.
What does the film get right?
Planet of the Humans makes several entirely valid points. Here are a few:
1. We need to deal with population growth
The film observes that population growth is the elephant in the room when it comes to climate change. It says politicians are reluctant to talk about limits to population growth "because that would be bad for business".
As one observer in the film says, the people in charge aren't nervous enough. I agree.
An increasing population means increasing demand for energy and other resources, accelerating climate change.
2. Biomass energy does more harm than good
While the film unfairly criticises the environmental benefits of solar energy, it's true that some so-called clean technologies are not green at all.
As the film asserts, destroying forests for biomass energy does more harm than good – due to loss of habitat, damage to water systems, and the time taken for some forests to recover from the removal of wood.
Most advocates of cleaner energy systems recognise the limitations of biomass as an energy source.
3. Infinite growth on a finite planet is suicide
The film calculates the sum total of human demands on natural systems as about 1,000 times what it was 200 years ago. It says there are ten times as many people now, each using 100 times the resources, on average.
Experts have repeatedly warned that human demand for resources is damaging the natural systems that all life depends on.
For large parts of the world, the consequences could be catastrophic.
Get the message
Several other aspects of the film have been savaged by critics – not least its claims about emissions produced by electric cars, which had previously been debunked.
Personal attacks on two prominent US clean energy advocates, Bill McKibben and Al Gore, also detract from the film's impact.
It's clear renewable energy has an important role to play in reducing greenhouse gas emissions and slowing climate change. But it won't solve the fundamental problem: that humans must live within Earth's natural limits.
Those cheering the film's criticism of renewables would do well to consider its overriding message.
Correction: A previous version of this article said the claim that solar panels produce less energy than they generate in their lifetime has long been disproved. This has been amended.
This article is republished from The Conversation under a Creative Commons license. Read the original article.
