A carbon neutral ETF (ExchangeTraded Fund) is an investment fund that aims to reduce or offset its carbon footprint, typically by investing in companies that have a low carbon intensity or by investing in carbon offset projects、Here are some popular carbon neutral ETFs:

1、iShares MSCI ACWI Low Carbon Target ETF (CRBN): This ETF tracks the MSCI ACWI Low Carbon Target Index, which includes largecap and midcap stocks from developed and emerging markets with low carbon emissions.
2、SPDR S&P 500 Carbon Sink ETF (XNTK): This ETF tracks the S&P 500 Carbon Sink Index, which includes S&P 500 companies with low carbon emissions and high carbon reduction targets.
3、Vanguard ESG Global Stock Index Fund (VEIGX): This ETF tracks the FTSE Developed All Cap ex US Index and the FTSE Emerging Markets All Cap China A Inclusion Index, focusing on companies with strong environmental, social, and governance (ESG) practices, including low carbon emissions.
4、iShares MSCI USA ESG Enhanced ETF (ESG): This ETF tracks the MSCI USA ESG Enhanced Index, which includes largecap and midcap US stocks with high ESG ratings and low carbon emissions.
5、First Trust Indxx Innovative Transaction & Process ETF (LEGR): This ETF tracks the Indxx Innovative Transaction & Process Index, which includes companies with low carbon emissions and innovative business models.

Some carbonneutral ETFs focus specifically on clean energy, sustainable infrastructure, or ecofriendly companies:

1、Invesco PowerShares Global Water ETF (PIO): This ETF tracks the Nasdaq OMX Global Water Index, which includes companies involved in water conservation, wastewater treatment, and sustainable water management.
2、First Trust Global Wind Energy ETF (FAN): This ETF tracks the S&P Global Wind Energy Index, which includes companies involved in the wind energy industry.
3、iShares Global Clean Energy ETF (ICLN): This ETF tracks the S&P Global Clean Energy Index, which includes companies involved in renewable energy, energy efficiency, and sustainable energy.

Keep in mind that while these ETFs aim to reduce carbon footprint, they may still have some indirect exposure to carbonintensive industries.

Things to consider:

1、Investment objectives: Understand the ETF's investment goals, strategies, and underlying index methodology.
2、Expenses: Look at the ETF's expense ratio, trading costs, and other fees.
3、Diversification: Assess the ETF's diversification across sectors, geographies, and asset classes.
4、Carbon metrics: Evaluate the ETF's carbon footprint, measured by metrics such as carbon intensity (Scope 1, 2, and 3 emissions).
5、Transparency: Ensure the ETF provides transparent holdings and carbon metrics.

Sources:

1、ETF.com: A comprehensive ETF database and research platform.
2、Morningstar: A leading provider of investment research and analysis.
3、MSCI: A prominent provider of ESG (Environmental, Social, and Governance) research and indexes.

By considering these factors, you can make informed investment decisions and choose a carbonneutral ETF that aligns with your values and financial goals.