Two carbon-neutral cryptocurrency-backed exchange-traded funds (ETF) are poised to launch in Canada, offering a greener alternative for institutional investors.

Canada-based asset manager Purpose Investments is preparing to launch two new crypto-based ETFs on the Toronto Stock Exchange on Tuesday, both of which offer investors a carbon offset.

Purpose will launch its Bitcoin 

BTC

$20,727

 and Ether 

ETH

$1,526

 ETFs under the BTCC.J and ETHH.J tickers. Unlike the funds recently launched in the United States, which are futures contract backed, these funds will be backed and settled using BTC as the underlying asset.

The Toronto-based firm has partnered with Patch, a firm that will help it measure the carbon footprint of the crypto portfolios and offer carbon-removal solutions. Measuring the carbon footprint of crypto mining is no easy task, as there are so many variables, but the firm has detailed its efforts and the math in a white paper.

Purpose will then invest in vetted carbon offsetting projects with the aim to give clients carbon-neutral exposure to BTC. Some of the projects it will invest in include direct air capture, biomass, mineralization or carbon dioxide removal, forestry, ocean fertilization and soil management.

According to the firm’s prospectus, Purpose’s new BTC fund held 24,167 BTC (approximately $1.6 billion), while the Ether fund had 86,906 ETH (worth roughly $417 million) as of Monday.

Related: Green Bitcoin: The impact and importance of energy use for PoW

The Purpose Bitcoin ETF (BTCC-B.TO) was North America’s first Bitcoin fund, which launched in February. It currently has more than $1 million in volume and has returned almost 20% over the past month, according to Yahoo Finance.

The Purpose Ether ETF (ETHH.TO) is not as popular, with just $210,000 in daily volume, but it has made a better return of 38% over the past 30 days.

The company also launched the first ETF that incorporates carbon offsetting in Europe in June. The fund is trading on the London Stock Exchange under the ticker ZERO and tracks the S&P Global Clean Energy Select Index.